Version updated

Assume .NET 7+ paths by default and delete legacy fallback-only event handler declarations.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -11,10 +11,10 @@ assignees: ''
 
 IMPORTANT: Read this first!!!
 
-1. If you own a Radzen Blazor subscription you can report your issue or ask us a question via email at info@radzen.com. Radzen staff will reply within 24 hours (Pro) or 16 hours (Team)
+1. If you own a Radzen Blazor Pro or Team subscription you can also report your issue or ask us a question via email at info@radzen.com. Radzen staff will reply within 24 hours (Pro) or 16 hours (Team)
 2. The Radzen staff guarantees a response to issues in this repo only to paid subscribers. 
 3. If you have a HOW TO question start a new forum thread in the Radzen Community forum: https://forum.radzen.com. Radzen staff will close issues that are HOWTO questions.
-4. Please adhere to the issue template. Specify all the steps required to reproduce the issue or link a project which reproduces it easily (without requiring extra steps such as restoring a database).
+4. Please adhere to the issue template. Specify all the steps required to reproduce the issue.
 -->
 
 **Describe the bug**
@@ -27,7 +27,12 @@ Steps to reproduce the behavior:
 3. Scroll down to '....'
 4. See error
 
-Alternatively link your repo with a sample project that can be run.
+Alternatively make a new [playground](https://blazor.radzen.com/playground) snippet and paste its URL.
+1. Go to any live demo at https://blazor.radzen.com
+2. Click the **Edit Source** tab.
+3. Then click **Open in Playground**.
+4. Reproduce the problem and save the snippet.
+5. Copy the snippet URL and provide it in the issue description.
 
 **Expected behavior**
 A clear and concise description of what you expected to happen.

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 9.0.x
+        dotnet-version: 10.0.x
     
     - name: Build
       run: dotnet build Radzen.Blazor/Radzen.Blazor.csproj

.github/workflows/deploy.yml

@@ -0,0 +1,66 @@
+name: Deploy to blazor.radzen.com
+
+on:
+  workflow_dispatch:
+
+concurrency:
+  group: blazor-radzen-prod
+  cancel-in-progress: true
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    env:
+      REGISTRY: ghcr.io
+      IMAGE_NAME: ${{ github.repository }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Compute image tag (timestamp)
+        id: meta
+        run: |
+          TAG=$(date -u +"%Y%m%d%H%M%S")
+          IMAGE="${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${TAG}"
+          echo "image=$IMAGE" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.image }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Push to dokku
+        uses: dokku/github-action@master
+        with:
+          git_remote_url: ${{ secrets.DOKKU_REPO }}
+          ssh_private_key: ${{ secrets.DOKKU_SSH_PRIVATE_KEY }}
+          deploy_docker_image: ${{ steps.meta.outputs.image }}
+
+      - name: Prune GHCR versions (keep 1)
+        uses: actions/delete-package-versions@v5
+        with:
+          package-name: radzen-blazor
+          package-type: container
+          min-versions-to-keep: 1
+          delete-only-pre-release-versions: false

Directory.Build.props

@@ -0,0 +1,85 @@
+<Project>
+  <!-- 
+    Common build properties for all projects in the Radzen.Blazor solution.
+    
+    To use this file:
+    1. Rename to Directory.Build.props (remove .sample extension)
+    2. Adjust settings based on your needs
+    3. Review the analyzer settings in .editorconfig
+    
+    This file will be automatically imported by all projects in subdirectories.
+  -->
+
+  <PropertyGroup Label="Language Configuration">
+    <!-- Use latest C# language features -->
+    <LangVersion>latest</LangVersion>
+    
+    <!-- Do NOT enable implicit usings - explicit imports preferred for library code -->
+    <ImplicitUsings>disable</ImplicitUsings>
+    
+    <Nullable>enable</Nullable>
+    <NoWarn>CA2007</NoWarn>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Code Analysis Configuration">
+    <!-- Enable .NET code analyzers -->
+    <AnalysisLevel>latest</AnalysisLevel>
+    <EnableNETAnalyzers>true</EnableNETAnalyzers>
+    
+    <!-- Run analyzers during build and in IDE -->
+    <RunAnalyzersDuringBuild>true</RunAnalyzersDuringBuild>
+    <RunAnalyzersDuringLiveAnalysis>true</RunAnalyzersDuringLiveAnalysis>
+    
+    <!-- Don't enforce code style in build (yet) - just show warnings -->
+    <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+    
+    <!-- Don't treat warnings as errors (yet) - too many to fix immediately -->
+    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    
+    <!-- Report all analyzer diagnostics -->
+    <AnalysisMode>All</AnalysisMode>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Build Quality">
+    <!-- Enable deterministic builds for reproducibility -->
+    <Deterministic>true</Deterministic>
+    
+    <!-- Enable deterministic builds in CI/CD -->
+    <ContinuousIntegrationBuild Condition="'$(CI)' == 'true'">true</ContinuousIntegrationBuild>
+    
+    <!-- Embed source files for better debugging -->
+    <EmbedAllSources>true</EmbedAllSources>
+    <!--
+      IMPORTANT:
+      - NuGet symbol packages (.snupkg) require portable PDB files.
+      - If DebugType=embedded, there are no standalone PDBs, so the .snupkg ends up effectively empty.
+      Use portable PDBs when symbols are enabled; otherwise use embedded for local debugging convenience.
+    -->
+    <!--
+      NOTE: Directory.Build.props is imported before project files, so properties like IncludeSymbols
+      set in a .csproj may not be available yet for Conditions here.
+      IsPacking *is* set by `dotnet pack`, so use that to switch DebugType for symbol packages.
+    -->
+    <DebugType Condition="'$(IsPacking)' == 'true'">portable</DebugType>
+    <DebugType Condition="'$(IsPacking)' != 'true'">embedded</DebugType>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Demos and Tests Project Configuration" Condition="$(MSBuildProjectName.Contains('Demos')) OR $(MSBuildProjectName.Contains('Tests'))">
+    <!-- Demo projects and Tests should not be packable -->
+    <IsPackable>false</IsPackable>
+    
+    <!-- DISABLE ALL ANALYZERS FOR DEMO PROJECTS AND TESTS -->
+    <EnableNETAnalyzers>false</EnableNETAnalyzers>
+    <RunAnalyzersDuringBuild>false</RunAnalyzersDuringBuild>
+    <RunAnalyzersDuringLiveAnalysis>false</RunAnalyzersDuringLiveAnalysis>
+    <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Performance">
+    <!-- Optimize startup time -->
+    <TieredCompilation>true</TieredCompilation>
+    <TieredCompilationQuickJit>true</TieredCompilationQuickJit>
+  </PropertyGroup>
+
+</Project>
+

Dockerfile

@@ -1,23 +1,48 @@
-FROM mcr.microsoft.com/dotnet/sdk:9.0
+# =============================
+# BUILD STAGE
+# =============================
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
 
-COPY Radzen.Blazor /app/Radzen.Blazor
-COPY Radzen.DocFX /app/Radzen.DocFX
-COPY RadzenBlazorDemos /app/RadzenBlazorDemos
-COPY RadzenBlazorDemos.Host /app/RadzenBlazorDemos.Host
+# Copy project files first for better caching
+COPY Radzen.Blazor/*.csproj Radzen.Blazor/
+COPY RadzenBlazorDemos/*.csproj RadzenBlazorDemos/
+COPY RadzenBlazorDemos.Host/*.csproj RadzenBlazorDemos.Host/
 
-WORKDIR /app
+# Radzen.DocFX usually has no csproj → copy full folder
+COPY Radzen.DocFX/ Radzen.DocFX/
 
+# Restore dependencies
+RUN dotnet restore RadzenBlazorDemos.Host/RadzenBlazorDemos.Host.csproj
+
+# Copy full source after restore layer
+COPY . .
+
+# Install docfx (build stage only)
 RUN dotnet tool install -g docfx
 ENV PATH="$PATH:/root/.dotnet/tools"
-RUN wget https://dot.net/v1/dotnet-install.sh \
-    && bash dotnet-install.sh --channel 8.0 --runtime dotnet --install-dir /usr/share/dotnet
+
+# Build shared project (keep net8.0 if required)
 RUN dotnet build -c Release Radzen.Blazor/Radzen.Blazor.csproj -f net8.0
+
+# Generate documentation
 RUN docfx Radzen.DocFX/docfx.json
 
-WORKDIR /app/RadzenBlazorDemos.Host
-RUN dotnet publish -c Release -o out
+# Publish the Blazor host app
+WORKDIR /src/RadzenBlazorDemos.Host
+RUN dotnet publish -c Release -o /app/out
 
-ENV ASPNETCORE_URLS=http://*:5000
-WORKDIR /app/RadzenBlazorDemos.Host/out
+
+# =============================
+# RUNTIME STAGE
+# =============================
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS runtime
+WORKDIR /app
+
+# Copy only published output
+COPY --from=build /app/out ./
+
+# Set runtime URL
+ENV ASPNETCORE_URLS=http://+:5000
 
 ENTRYPOINT ["dotnet", "RadzenBlazorDemos.Host.dll"]

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2018-2025 Radzen Ltd
+Copyright (c) 2018-2026 Radzen Ltd
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -54,4 +54,4 @@ Check the [getting started](https://blazor.radzen.com/get-started) instructions
 
 ## Run demos locally
 
-Use Radzen.Server.sln to open and run demos as Blazor server application or Radzen.WebAssembly.sln to open and run demos as Blazor WebAssembly application. Radzen.sln has reference to all projects including tests.
+Use **Radzen.Server.sln** to open and run demos as Blazor server application or **Radzen.WebAssembly.sln** to open and run demos as Blazor WebAssembly application. The demos require the .NET 10 SDK and should preferably be opened in VS2026.

Radzen.Blazor.Tests/AccordionTests.cs

@@ -123,7 +123,7 @@ namespace Radzen.Blazor.Tests
             });
 
             // Find and click the accordion header link to expand
-            var header = component.Find(".rz-accordion-header a");
+            var header = component.Find(".rz-accordion-header button");
             header.Click();
 
             Assert.True(expandRaised);
@@ -156,7 +156,7 @@ namespace Radzen.Blazor.Tests
             });
 
             // Find and click the accordion header link to collapse
-            var header = component.Find(".rz-accordion-header a");
+            var header = component.Find(".rz-accordion-header button");
             header.Click();
 
             Assert.True(collapseRaised);
@@ -184,7 +184,7 @@ namespace Radzen.Blazor.Tests
             });
 
             // Try to click the disabled item
-            var header = component.Find(".rz-accordion-header a");
+            var header = component.Find(".rz-accordion-header button");
             header.Click();
 
             // Event should not be raised for disabled item

Radzen.Blazor.Tests/AutoCompleteTests.cs

@@ -1,6 +1,9 @@
-using Bunit;
+using System.Collections;
+using Bunit;
 using Xunit;
 using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
 
 namespace Radzen.Blazor.Tests
 {
@@ -135,5 +138,30 @@ namespace Radzen.Blazor.Tests
             Assert.Equal("additional-name", AutoCompleteType.MiddleName.GetAutoCompleteValue());
             Assert.Equal("family-name", AutoCompleteType.LastName.GetAutoCompleteValue());
         }
+
+        [Fact]
+        public void AutoComplete_Filters_StringList()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            var data = new List<string> { "Apple", "Banana", "Cherry" };
+
+            var component = ctx.RenderComponent<AutoCompleteWithAccessibleView>(parameters =>
+            {
+                parameters
+                    .Add(p => p.Data, data)
+                    .Add(p => p.SearchText, "Ban")
+                    .Add(p => p.OpenOnFocus, true);
+            });
+            
+            Assert.Contains("Banana", component.Instance.CurrentView.OfType<string>());
+            Assert.DoesNotContain("Apple", component.Instance.CurrentView.OfType<string>());
+            Assert.DoesNotContain("Cherry", component.Instance.CurrentView.OfType<string>());
+        }
+        
+        private sealed class AutoCompleteWithAccessibleView : RadzenAutoComplete
+        {
+            public IEnumerable CurrentView => View;
+        }
     }
 }

Radzen.Blazor.Tests/DataGridTests.cs

@@ -1728,6 +1728,7 @@ namespace Radzen.Blazor.Tests
                 {
                     builder.OpenComponent(0, typeof(RadzenDataGridColumn<dynamic>));
                     builder.AddAttribute(1, "Property", "Name");
+                    builder.AddAttribute(2, "Type", typeof(string));
                     builder.CloseComponent();
                 });
                 parameterBuilder.Add<bool>(p => p.AllowFiltering, true);
@@ -1751,6 +1752,7 @@ namespace Radzen.Blazor.Tests
                 {
                     builder.OpenComponent(0, typeof(RadzenDataGridColumn<dynamic>));
                     builder.AddAttribute(1, "Property", "Name");
+                    builder.AddAttribute(1, "Type", typeof(string));
                     builder.CloseComponent();
                 });
                 parameterBuilder.Add<bool>(p => p.AllowFiltering, true);
@@ -2804,6 +2806,12 @@ namespace Radzen.Blazor.Tests
                     builder.AddAttribute(1, "Property", "Id");
                     builder.AddAttribute(2, "Title", "Id");
                     builder.CloseComponent();
+
+                    builder.OpenComponent(3, typeof(RadzenDataGridColumn<dynamic>));
+                    builder.AddAttribute(4, "Property", "Tags");
+                    builder.AddAttribute(5, "Title", "Tags");
+                    builder.AddAttribute(6, "Type", typeof(object[]));
+                    builder.CloseComponent();
                 });
                 parameterBuilder.Add<bool>(p => p.AllowFiltering, true);
                 parameterBuilder.Add<FilterMode>(p => p.FilterMode, FilterMode.SimpleWithMenu);
@@ -2834,6 +2842,12 @@ namespace Radzen.Blazor.Tests
                     builder.AddAttribute(1, "Property", "Id");
                     builder.AddAttribute(2, "Title", "Id");
                     builder.CloseComponent();
+
+                    builder.OpenComponent(3, typeof(RadzenDataGridColumn<dynamic>));
+                    builder.AddAttribute(4, "Property", "Tags");
+                    builder.AddAttribute(5, "Title", "Tags");
+                    builder.AddAttribute(6, "Type", typeof(object[]));
+                    builder.CloseComponent();
                 });
                 parameterBuilder.Add<bool>(p => p.AllowFiltering, true);
                 parameterBuilder.Add<FilterMode>(p => p.FilterMode, FilterMode.SimpleWithMenu);

Radzen.Blazor.Tests/DatePickerTests.cs

@@ -155,7 +155,7 @@ namespace Radzen.Blazor.Tests
                 parameters.Add<bool>(p => p.AllowClear, true);
             });
 
-            Assert.Contains(@$"<i class=""notranslate rz-dropdown-clear-icon rzi rzi-times""", component.Markup);
+            Assert.Contains(@$"<button type=""button"" class=""notranslate rz-dropdown-clear-icon rzi rzi-times""", component.Markup);
         }
 
         [Fact]

Radzen.Blazor.Tests/DialogServiceTests.cs

@@ -1,11 +1,15 @@
-using System;
+using Bunit;
+using Microsoft.AspNetCore.Components;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
 using Xunit;
 
 namespace Radzen.Blazor.Tests
 {
-	public class DialogServiceTests
+	public class DialogServiceTests : ComponentBase
 	{
 		public class OpenDialogTests
 		{
@@ -124,13 +128,81 @@ namespace Radzen.Blazor.Tests
                 var openTask = dialogService.OpenAsync("Dynamic Open", typeof(RadzenButton), []);
                 dialogService.Close();
                 await openTask;
-                
+
                 // Assert
                 Assert.Equal("Dynamic Open", resultingTitle);
                 Assert.Equal(typeof(RadzenButton), resultingType);
             }
 		}
 
+        public class OpenSideDialogTests
+        {
+            [Fact(DisplayName = "SideDialogOptions resizable option is retained after OpenSideDialog call")]
+            public void SideDialogOptions_Resizable_AreRetained_AfterOpenSideDialogCall()
+            {
+                // Arrange
+                var options = new SideDialogOptions { Resizable = true };
+                SideDialogOptions resultingOptions = null;
+                var dialogService = new DialogService(null, null);
+                dialogService.OnSideOpen += (_, _, sideOptions) => resultingOptions = sideOptions;
+
+                // Act
+                dialogService.OpenSide<DialogServiceTests>("Test", [], options);
+
+                // Assert
+                Assert.NotNull(resultingOptions);
+                Assert.Same(options, resultingOptions);
+                Assert.True(resultingOptions.Resizable);
+            }
+
+            [Fact(DisplayName = "Side dialog shows resize bar when Resizable is true")]
+            public void SideDialog_Resizable_ShowsResizeBar()
+            {
+                using var ctx = new TestContext();
+                ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+                ctx.Services.AddScoped<DialogService>();
+
+                // Render the dialog host
+                var cut = ctx.RenderComponent<RadzenDialog>();
+
+                // Open a side dialog with Resizable=true
+                var dialogService = ctx.Services.GetRequiredService<DialogService>();
+                cut.InvokeAsync(() => dialogService.OpenSide("Test", typeof(RadzenButton),
+                    new Dictionary<string, object>(), new SideDialogOptions { Resizable = true }));
+
+                // Assert: the resize bar element is present
+                cut.WaitForAssertion(() =>
+                {
+                    var markup = cut.Markup;
+                    Assert.Contains("rz-dialog-resize-bar", markup);
+                    // Optionally ensure the inner handle exists too
+                    Assert.Contains("rz-resize", markup);
+                });
+            }
+
+            [Fact(DisplayName = "Side dialog hides resize bar when Resizable is false")]
+            public void SideDialog_NonResizable_HidesResizeBar()
+            {
+                using var ctx = new TestContext();
+                ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+                ctx.Services.AddScoped<DialogService>();
+
+                // Render the dialog host
+                var cut = ctx.RenderComponent<RadzenDialog>();
+
+                // Open a side dialog with Resizable=false
+                var dialogService = ctx.Services.GetRequiredService<DialogService>();
+                cut.InvokeAsync(() => dialogService.OpenSide("Test", typeof(RadzenButton),
+                    new Dictionary<string, object>(), new SideDialogOptions()));
+
+                // Assert: the resize bar element is not present
+                cut.WaitForAssertion(() =>
+                {
+                    var markup = cut.Markup;
+                    Assert.DoesNotContain("rz-dialog-resize-bar", markup);
+                });
+            }
+        }
 		public class ConfirmTests
 		{
 			[Fact(DisplayName = "ConfirmOptions is null and default values are set correctly")]

Radzen.Blazor.Tests/ExpressionParserTests.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -1026,6 +1026,36 @@ public class ExpressionParserTests
         Assert.True(func(new Person { BirthDate = DateTime.Parse("5/5/2000 12:00:00 AM") }));
     }
 
+    class EmployeeWithHireDate
+    {
+        public DateTime? HireDate { get; set; }
+        public DateOnly? HireDateOnly { get; set; }
+    }
+
+    [Fact]
+    public void Should_SupportNullableDateTimeArrayWithSpecifyKindAndNullableProperty()
+    {
+        var predicate = "x => new System.DateTime?[] { DateTime.SpecifyKind(DateTime.Parse(\"2012-04-01\", CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind), DateTimeKind.Unspecified) }.Contains((x.HireDate ?? null))";
+        var expression = ExpressionParser.ParsePredicate<EmployeeWithHireDate>(predicate);
+        var func = expression.Compile();
+
+        var hireDate = DateTime.SpecifyKind(DateTime.Parse("2012-04-01", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.RoundtripKind), DateTimeKind.Unspecified);
+        Assert.True(func(new EmployeeWithHireDate { HireDate = hireDate }));
+        Assert.False(func(new EmployeeWithHireDate { HireDate = DateTime.Parse("2013-01-01") }));
+    }
+
+    [Fact]
+    public void Should_SupportNullableDateOnlyArrayAndNullableProperty()
+    {
+        var predicate = "x => new System.DateOnly?[] { DateOnly.Parse(\"2012-04-01\") }.Contains((x.HireDateOnly ?? null))";
+        var expression = ExpressionParser.ParsePredicate<EmployeeWithHireDate>(predicate);
+        var func = expression.Compile();
+
+        var hireDate = DateOnly.Parse("2012-04-01");
+        Assert.True(func(new EmployeeWithHireDate { HireDateOnly = hireDate }));
+        Assert.False(func(new EmployeeWithHireDate { HireDateOnly = DateOnly.Parse("2013-01-01") }));
+    }
+
     [Fact]
     public void Should_SupportNumericConversion()
     {

Radzen.Blazor.Tests/ExpressionSerializerTests.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
@@ -22,7 +22,7 @@ namespace Radzen.Blazor.Tests
         public Guid Id { get; set; }
         public TimeOnly StartTime { get; set; }
         public DateOnly BirthDate { get; set; }
-        public int[] Scores { get; set; }
+        public IEnumerable<int> Scores { get; set; }
         public List<string> Tags { get; set; }
         public List<TestEntity> Children { get; set; }
         public Address Address { get; set; }
@@ -319,5 +319,35 @@ namespace Radzen.Blazor.Tests
             Expression<Func<TestEntity, bool>> expr = e => !e.Tags.Contains("Member");
             Assert.Equal("e => (!(e.Tags.Contains(\"Member\")))", _serializer.Serialize(expr));
         }
+
+        [Fact]
+        public void Serializes_DefaultExpression_ReferenceType()
+        {
+            // Simulates the NullPropagate pattern: x.Address == null ? default(string) : x.Address.City
+            var param = Expression.Parameter(typeof(TestEntity), "x");
+            var address = Expression.Property(param, "Address");
+            var city = Expression.Property(address, "City");
+            var isNull = Expression.Equal(address, Expression.Constant(null, typeof(Address)));
+            var whenNull = Expression.Default(typeof(string));
+            var conditional = Expression.Condition(isNull, whenNull, city);
+            var lambda = Expression.Lambda<Func<TestEntity, string>>(conditional, param);
+
+            Assert.Equal("x => ((x.Address == null) ? null : x.Address.City)", _serializer.Serialize(lambda));
+        }
+
+        [Fact]
+        public void Serializes_DefaultExpression_ValueType()
+        {
+            // Simulates a conditional with a default value type
+            var param = Expression.Parameter(typeof(TestEntity), "x");
+            var address = Expression.Property(param, "Address");
+            var age = Expression.Property(param, "Age");
+            var isNull = Expression.Equal(address, Expression.Constant(null, typeof(Address)));
+            var whenNull = Expression.Default(typeof(int));
+            var conditional = Expression.Condition(isNull, whenNull, age);
+            var lambda = Expression.Lambda<Func<TestEntity, int>>(conditional, param);
+
+            Assert.Equal("x => ((x.Address == null) ? default(int) : x.Age)", _serializer.Serialize(lambda));
+        }
     }
 }

Radzen.Blazor.Tests/FieldsetTests.cs

@@ -152,7 +152,7 @@ namespace Radzen.Blazor.Tests
                 parameters.Add(p => p.Collapse, args => { raised = true; });
             });
 
-            component.Find("a").Click();
+            component.Find("legend button").Click();
 
             Assert.True(raised);
 
@@ -160,7 +160,7 @@ namespace Radzen.Blazor.Tests
 
             component.SetParametersAndRender(parameters => parameters.Add(p => p.Expand, args => { raised = true; }));
 
-            component.Find("a").Click();
+            component.Find("legend button").Click();
         }
 
         [Fact]

Radzen.Blazor.Tests/LoginTests.cs

@@ -119,7 +119,7 @@ namespace Radzen.Blazor.Tests
                 parameters.Add(p => p.AllowResetPassword, true);
             });
 
-            Assert.Contains(@$"Forgot password?</a>", component.Markup);
+            Assert.Contains(@$"Forgot password?</span>", component.Markup);
         }
 
         [Fact]
@@ -134,7 +134,7 @@ namespace Radzen.Blazor.Tests
                 parameters.Add(p => p.ResetPasswordText, "Test");
             });
 
-            Assert.Contains(@$"Test</a>", component.Markup);
+            Assert.Contains(@$"Test</span>", component.Markup);
         }
 
         [Fact]
@@ -195,7 +195,7 @@ namespace Radzen.Blazor.Tests
                 parameters.Add(p => p.Register, args => { clicked = true; });
             });
 
-            component.Find(".rz-secondary").Click();
+            component.Find(".rz-secondary.rz-variant-flat").Click();
 
             Assert.True(clicked);
         }
@@ -215,7 +215,7 @@ namespace Radzen.Blazor.Tests
                 parameters.Add(p => p.ResetPassword, args => { clicked = true; });
             });
 
-            component.Find("a").Click();
+            component.Find(".rz-secondary.rz-variant-text").Click();
 
             Assert.True(clicked);
         }
@@ -234,7 +234,7 @@ namespace Radzen.Blazor.Tests
                 parameters.Add(p => p.ResetPassword, args => { clicked = true; });
             });
 
-            component.Find("a").Click();
+            component.Find(".rz-secondary.rz-variant-text").Click();
 
             Assert.True(clicked);
         }

Radzen.Blazor.Tests/Markdown/HtmlInlineTests.cs

@@ -141,4 +141,28 @@ foo <!---> foo -->
     {
         Assert.Equal(expected, ToXml(markdown));
     }
+
+    [Theory]
+    [InlineData("***foo bar***", @"<document>
+    <paragraph>
+        <emph>
+            <strong>
+                <text>foo bar</text>
+            </strong>
+        </emph>
+    </paragraph>
+</document>")]
+    [InlineData("___foo bar___", @"<document>
+    <paragraph>
+        <emph>
+            <strong>
+                <text>foo bar</text>
+            </strong>
+        </emph>
+    </paragraph>
+</document>")]
+    public void Parse_BoldAndItalic_ShouldNotThrowException(string markdown, string expected)
+    {
+        Assert.Equal(expected, ToXml(markdown));
+    }
 }

Radzen.Blazor.Tests/PagerTests.cs

@@ -2,6 +2,7 @@ using Bunit;
 using Bunit.JSInterop;
 using System;
 using System.Collections.Generic;
+using System.Threading.Tasks;
 using Xunit;
 
 namespace Radzen.Blazor.Tests
@@ -54,7 +55,7 @@ namespace Radzen.Blazor.Tests
         }
 
         [Fact]
-        public async void RadzenPager_Renders_Summary() {
+        public async Task RadzenPager_Renders_Summary() {
             using var ctx = new TestContext();
             ctx.JSInterop.Mode = JSRuntimeMode.Loose;
             ctx.JSInterop.SetupModule("_content/Radzen.Blazor/Radzen.Blazor.js");
@@ -64,7 +65,7 @@ namespace Radzen.Blazor.Tests
                 parameters.Add<int>(p => p.Count, 100);
                 parameters.Add<bool>(p => p.ShowPagingSummary, true);
             });
-            await component.Instance.GoToPage(2);
+            await component.InvokeAsync(() => component.Instance.GoToPage(2));
             component.Render();
 
             Assert.Contains(@$"rz-pager-summary", component.Markup); 
@@ -111,7 +112,7 @@ namespace Radzen.Blazor.Tests
         }
 
         [Fact]
-        public async void RadzenPager_First_And_Prev_Buttons_Are_Disabled_When_On_The_First_Page()
+        public async Task RadzenPager_First_And_Prev_Buttons_Are_Disabled_When_On_The_First_Page()
         {
             using var ctx = new TestContext();
             ctx.JSInterop.Mode = JSRuntimeMode.Loose;
@@ -123,18 +124,18 @@ namespace Radzen.Blazor.Tests
                 parameters.Add<bool>(p => p.ShowPagingSummary, true);
             });
 
-            await component.Instance.GoToPage(0);
+            await component.InvokeAsync(() => component.Instance.GoToPage(0));
             component.Render();
 
-            var firstPageButton = component.Find("a.rz-pager-first");
+            var firstPageButton = component.Find("button.rz-pager-first");
             Assert.True(firstPageButton.HasAttribute("disabled"));
 
-            var prevPageButton = component.Find("a.rz-pager-prev");
+            var prevPageButton = component.Find("button.rz-pager-prev");
             Assert.True(prevPageButton.HasAttribute("disabled"));
         }
 
         [Fact]
-        public async void RadzenPager_Last_And_Next_Buttons_Are_Disabled_When_On_The_Last_Page()
+        public async Task RadzenPager_Last_And_Next_Buttons_Are_Disabled_When_On_The_Last_Page()
         {
             using var ctx = new TestContext();
             ctx.JSInterop.Mode = JSRuntimeMode.Loose;
@@ -146,13 +147,13 @@ namespace Radzen.Blazor.Tests
                 parameters.Add<bool>(p => p.ShowPagingSummary, true);
             });
 
-            await component.Instance.GoToPage(9);
+            await component.InvokeAsync(() => component.Instance.GoToPage(9));
             component.Render();
 
-            var lastPageButton = component.Find("a.rz-pager-last");
+            var lastPageButton = component.Find("button.rz-pager-last");
             Assert.True(lastPageButton.HasAttribute("disabled"));
 
-            var nextPageButton = component.Find("a.rz-pager-next");
+            var nextPageButton = component.Find("button.rz-pager-next");
             Assert.True(nextPageButton.HasAttribute("disabled"));
         }
     }

Radzen.Blazor.Tests/PanelTests.cs

@@ -167,7 +167,7 @@ namespace Radzen.Blazor.Tests
                 parameters.Add(p => p.Collapse, args => { raised = true; });
             });
 
-            component.Find("a").Click();
+            component.Find("button.rz-panel-titlebar-toggler").Click();
 
             Assert.True(raised);
 
@@ -175,7 +175,7 @@ namespace Radzen.Blazor.Tests
 
             component.SetParametersAndRender(parameters => parameters.Add(p => p.Expand, args => { raised = true; }));
 
-            component.Find("a").Click();
+            component.Find("button.rz-panel-titlebar-toggler").Click();
         }
 
         [Fact]

Radzen.Blazor.Tests/PasswordTests.cs

@@ -171,24 +171,49 @@ namespace Radzen.Blazor.Tests
 
             Assert.Contains(@$"autofocus", component.Markup);
         }
-        
+
         [Fact]
         public void Password_Raises_ChangedEvent()
         {
             using var ctx = new TestContext();
-
-            var component = ctx.RenderComponent<RadzenPassword>();
-
-            var raised = false;
+            var hasRaised = false;
             var value = "Test";
             object newValue = null;
 
-            component.SetParametersAndRender(parameters => parameters.Add(p => p.Change, args => { raised = true; newValue = args; }));
+            var component = ctx.RenderComponent<RadzenPassword>(parameters =>
+            {
+                parameters.Add(p => p.Change, args => { hasRaised = true; newValue = args; });
+                parameters.Add(p => p.Immediate, false);
+            });
 
-            component.Find("input").Change(value);
+            var inputElement = component.Find("input");
+            inputElement.Change(value);
 
-            Assert.True(raised);
-            Assert.True(object.Equals(value, newValue));
+            Assert.DoesNotContain("oninput", inputElement.ToMarkup());
+            Assert.True(hasRaised);
+            Assert.Equal(value, newValue);
+        }
+
+        [Fact]
+        public void Password_Raises_InputEvent()
+        {
+            using var ctx = new TestContext();
+            var hasRaised = false;
+            var value = "Test";
+            object newValue = null;
+
+            var component = ctx.RenderComponent<RadzenPassword>(parameters =>
+            {
+                parameters.Add(p => p.Change, args => { hasRaised = true; newValue = args; });
+                parameters.Add(p => p.Immediate, true);
+            });
+
+            var inputElement = component.Find("input");
+            inputElement.Input(value);
+
+            Assert.DoesNotContain("onchange", inputElement.ToMarkup());
+            Assert.True(hasRaised);
+            Assert.Equal(value, newValue);
         }
 
         [Fact]

Radzen.Blazor.Tests/PickListTests.cs

@@ -1,6 +1,7 @@
 using Bunit;
 using Xunit;
 using System.Collections.Generic;
+using System.Linq;
 
 namespace Radzen.Blazor.Tests
 {
@@ -156,6 +157,64 @@ namespace Radzen.Blazor.Tests
 
             Assert.Contains("disabled", component.Markup);
         }
+
+        [Fact]
+        public void PickList_GetSelectedSources_Respects_ValueProperty_Single()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var data = new List<Item>
+            {
+                new Item { Id = 1, Name = "A" },
+                new Item { Id = 2, Name = "B" }
+            };
+
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.Source, data);
+                parameters.Add(p => p.TextProperty, "Name");
+                parameters.Add(p => p.ValueProperty, "Id");
+                parameters.Add(p => p.Multiple, false);
+            });
+
+            // Simulate ListBox selection when ValueProperty is set: selectedSourceItems becomes the value (Id)
+            var field = typeof(RadzenPickList<Item>).GetField("selectedSourceItems", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
+            field.SetValue(component.Instance, 2);
+
+            var selected = component.Instance.GetSelectedSources();
+            Assert.Single(selected);
+            Assert.Equal(2, selected.First().Id);
+        }
+
+        [Fact]
+        public void PickList_GetSelectedSources_Respects_ValueProperty_Multiple()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+
+            var data = new List<Item>
+            {
+                new Item { Id = 1, Name = "A" },
+                new Item { Id = 2, Name = "B" },
+                new Item { Id = 3, Name = "C" }
+            };
+
+            var component = ctx.RenderComponent<RadzenPickList<Item>>(parameters =>
+            {
+                parameters.Add(p => p.Source, data);
+                parameters.Add(p => p.TextProperty, "Name");
+                parameters.Add(p => p.ValueProperty, "Id");
+                parameters.Add(p => p.Multiple, true);
+            });
+
+            // Simulate ListBox selection when ValueProperty is set: selectedSourceItems becomes IEnumerable of values (Ids)
+            var field = typeof(RadzenPickList<Item>).GetField("selectedSourceItems", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
+            field.SetValue(component.Instance, new[] { 1, 3 });
+
+            var selected = component.Instance.GetSelectedSources().Select(i => i.Id).OrderBy(i => i).ToArray();
+            Assert.Equal(new[] { 1, 3 }, selected);
+        }
     }
 }
 

Radzen.Blazor.Tests/PivotDataGridTests.cs

@@ -605,7 +605,7 @@ namespace Radzen.Blazor.Tests
             Assert.True(grid.AllowFieldsPicking);
         }
 
-        private static IRenderedComponent<RadzenPivotDataGrid<SalesData>> RenderPivotDataGrid(TestContext ctx, Action<ComponentParameterCollectionBuilder<RadzenPivotDataGrid<SalesData>>>? configure = null)
+        private static IRenderedComponent<RadzenPivotDataGrid<SalesData>> RenderPivotDataGrid(TestContext ctx, Action<ComponentParameterCollectionBuilder<RadzenPivotDataGrid<SalesData>>> configure = null)
         {
             return ctx.RenderComponent<RadzenPivotDataGrid<SalesData>>(parameters =>
             {

Radzen.Blazor.Tests/PropertyAccessTests.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using Xunit;
 
@@ -114,6 +114,11 @@ namespace Radzen.Blazor.Tests
             public List<string> Values { get; set; }
         }
 
+        public class Order
+        {
+            public DateTime? OrderDate { get; set; }
+        }
+
         [Fact]
         public void GetProperty_Should_Resolve_DescriptionProperty()
         {
@@ -137,6 +142,14 @@ namespace Radzen.Blazor.Tests
             Assert.NotNull(idProperty);
         }
 
+        [Fact]
+        public void GetPropertyType_Resolves_NullableDateTime_Date()
+        {
+            var propertyType = PropertyAccess.GetPropertyType(typeof(Order), "OrderDate.Date");
+
+            Assert.Equal(typeof(DateTime), propertyType);
+        }
+
         interface ISimpleInterface : ISimpleNestedInterface
         {
             string Description { get; set; }

Radzen.Blazor.Tests/QueryableExtensionTests.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using Xunit;
 using Radzen;
+using System.Linq.Expressions;
 
 namespace Radzen.Blazor.Tests
 {
@@ -24,6 +25,11 @@ namespace Radzen.Blazor.Tests
             public int Priority { get; set; }
         }
 
+        private class Order
+        {
+            public DateTime? OrderDate { get; set; }
+        }
+
         private List<TestItem> GetTestData()
         {
             return new List<TestItem>
@@ -36,6 +42,24 @@ namespace Radzen.Blazor.Tests
             };
         }
 
+        [Fact]
+        public void GetNestedPropertyExpression_Handles_NullableDateTime_Date()
+        {
+            var parameter = Expression.Parameter(typeof(Order), "x");
+            var expression = QueryableExtension.GetNestedPropertyExpression(parameter, "OrderDate.Date");
+            var getter = Expression.Lambda<Func<Order, DateTime>>(expression, parameter).Compile();
+
+            var order = new Order { OrderDate = new DateTime(2024, 2, 3, 14, 30, 0) };
+            var result = getter(order);
+
+            Assert.Equal(order.OrderDate.Value.Date, result);
+
+            var nullOrder = new Order { OrderDate = null };
+            var nullResult = getter(nullOrder);
+
+            Assert.Equal(default(DateTime), nullResult);
+        }
+
         // OrderBy tests
         [Fact]
         public void OrderBy_SortsAscending_ByDefault()
@@ -1689,6 +1713,838 @@ namespace Radzen.Blazor.Tests
             Assert.Single(result);
             Assert.Equal(2, result[0].Id);
         }
+
+        // CollectionFilterMode tests
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithEquals()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 10 }, new { Name = "tag2", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 30 }, new { Name = "tag4", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag1", Value = 50 }, new { Name = "tag5", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = "tag1",
+                    FilterOperator = FilterOperator.Equals,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag has Name == "tag1"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithEquals()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "active", Value = 10 }, new { Name = "active", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "active", Value = 30 }, new { Name = "inactive", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "active", Value = 50 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = "active",
+                    FilterOperator = FilterOperator.Equals,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags have Name == "active"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithGreaterThan()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 10 }, new { Name = "tag2", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 30 }, new { Name = "tag4", Value = 60 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 5 }, new { Name = "tag6", Value = 8 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Value",
+                    FilterValue = 50,
+                    FilterOperator = FilterOperator.GreaterThan,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag has Value > 50
+            Assert.Single(result);
+            Assert.Equal(2, result[0].Id);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithGreaterThan()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 60 }, new { Name = "tag2", Value = 70 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 30 }, new { Name = "tag4", Value = 60 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 55 }, new { Name = "tag6", Value = 80 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Value",
+                    FilterValue = 50,
+                    FilterOperator = FilterOperator.GreaterThan,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags have Value > 50
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithContains()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "important-task", Value = 10 }, new { Name = "review", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "normal", Value = 30 }, new { Name = "basic", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "important-meeting", Value = 50 }, new { Name = "urgent", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = "important",
+                    FilterOperator = FilterOperator.Contains,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag contains "important"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithContains()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "important-task", Value = 10 }, new { Name = "important-note", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "important-meeting", Value = 30 }, new { Name = "basic", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "important-reminder", Value = 50 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = "important",
+                    FilterOperator = FilterOperator.Contains,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags contain "important"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithStartsWith()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "prefix_alpha", Value = 10 }, new { Name = "other_beta", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "prefix_gamma", Value = 30 }, new { Name = "prefix_delta", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "other_epsilon", Value = 50 }, new { Name = "other_zeta", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = "prefix_",
+                    FilterOperator = FilterOperator.StartsWith,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag starts with "prefix_"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 2);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithStartsWith()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "prefix_alpha", Value = 10 }, new { Name = "prefix_beta", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "prefix_gamma", Value = 30 }, new { Name = "other_delta", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "prefix_epsilon", Value = 50 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = "prefix_",
+                    FilterOperator = FilterOperator.StartsWith,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags start with "prefix_"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithEndsWith()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "file.txt", Value = 10 }, new { Name = "doc.pdf", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "image.png", Value = 30 }, new { Name = "photo.txt", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "data.csv", Value = 50 }, new { Name = "info.doc", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = ".txt",
+                    FilterOperator = FilterOperator.EndsWith,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag ends with ".txt"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 2);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithEndsWith()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "file.txt", Value = 10 }, new { Name = "doc.txt", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "image.txt", Value = 30 }, new { Name = "photo.png", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "data.txt", Value = 50 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = ".txt",
+                    FilterOperator = FilterOperator.EndsWith,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags end with ".txt"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithNotEquals()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "active", Value = 10 }, new { Name = "inactive", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "inactive", Value = 30 }, new { Name = "inactive", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "pending", Value = 50 }, new { Name = "active", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = "inactive",
+                    FilterOperator = FilterOperator.NotEquals,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag is not equal to "inactive"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithNotEquals()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "active", Value = 10 }, new { Name = "pending", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "active", Value = 30 }, new { Name = "inactive", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "pending", Value = 50 }, new { Name = "active", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = "inactive",
+                    FilterOperator = FilterOperator.NotEquals,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags are not equal to "inactive"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithDoesNotContain()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "test-alpha", Value = 10 }, new { Name = "beta", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "test-gamma", Value = 30 }, new { Name = "test-delta", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "epsilon", Value = 50 }, new { Name = "zeta", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = "test",
+                    FilterOperator = FilterOperator.DoesNotContain,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag does not contain "test"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithDoesNotContain()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "alpha", Value = 10 }, new { Name = "beta", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "test-gamma", Value = 30 }, new { Name = "delta", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "epsilon", Value = 50 }, new { Name = "zeta", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterValue = "test",
+                    FilterOperator = FilterOperator.DoesNotContain,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags do not contain "test"
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithLessThan()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 10 }, new { Name = "tag2", Value = 50 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 60 }, new { Name = "tag4", Value = 70 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 15 }, new { Name = "tag6", Value = 80 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Value",
+                    FilterValue = 20,
+                    FilterOperator = FilterOperator.LessThan,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag has Value < 20
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithLessThan()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 10 }, new { Name = "tag2", Value = 15 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 18 }, new { Name = "tag4", Value = 70 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 5 }, new { Name = "tag6", Value = 12 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Value",
+                    FilterValue = 20,
+                    FilterOperator = FilterOperator.LessThan,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags have Value < 20
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithLessThanOrEquals()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 20 }, new { Name = "tag2", Value = 50 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 60 }, new { Name = "tag4", Value = 70 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 15 }, new { Name = "tag6", Value = 80 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Value",
+                    FilterValue = 20,
+                    FilterOperator = FilterOperator.LessThanOrEquals,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag has Value <= 20
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithLessThanOrEquals()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 10 }, new { Name = "tag2", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 18 }, new { Name = "tag4", Value = 70 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 5 }, new { Name = "tag6", Value = 12 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Value",
+                    FilterValue = 20,
+                    FilterOperator = FilterOperator.LessThanOrEquals,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags have Value <= 20
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithGreaterThanOrEquals()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 50 }, new { Name = "tag2", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 10 }, new { Name = "tag4", Value = 15 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 60 }, new { Name = "tag6", Value = 30 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Value",
+                    FilterValue = 50,
+                    FilterOperator = FilterOperator.GreaterThanOrEquals,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag has Value >= 50
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithGreaterThanOrEquals()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 50 }, new { Name = "tag2", Value = 60 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 55 }, new { Name = "tag4", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 70 }, new { Name = "tag6", Value = 80 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Value",
+                    FilterValue = 50,
+                    FilterOperator = FilterOperator.GreaterThanOrEquals,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags have Value >= 50
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithIsNull()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = (string)null, Value = 10 }, new { Name = "tag2", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 30 }, new { Name = "tag4", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = (string)null, Value = 50 }, new { Name = "tag6", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterOperator = FilterOperator.IsNull,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag has null Name
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithIsNull()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = (string)null, Value = 10 }, new { Name = (string)null, Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = (string)null, Value = 30 }, new { Name = "tag4", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = (string)null, Value = 50 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterOperator = FilterOperator.IsNull,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags have null Name
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithIsNotNull()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = (string)null, Value = 10 }, new { Name = "tag2", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = (string)null, Value = 30 }, new { Name = (string)null, Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 50 }, new { Name = "tag6", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterOperator = FilterOperator.IsNotNull,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag has non-null Name
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithIsNotNull()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 10 }, new { Name = "tag2", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 30 }, new { Name = (string)null, Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 50 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterOperator = FilterOperator.IsNotNull,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags have non-null Name
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithIsEmpty()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "", Value = 10 }, new { Name = "tag2", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 30 }, new { Name = "tag4", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "", Value = 50 }, new { Name = "tag6", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterOperator = FilterOperator.IsEmpty,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag has empty Name
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithIsEmpty()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "", Value = 10 }, new { Name = "", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "", Value = 30 }, new { Name = "tag4", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "", Value = 50 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterOperator = FilterOperator.IsEmpty,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags have empty Name
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_Any_WithIsNotEmpty()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "", Value = 10 }, new { Name = "tag2", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "", Value = 30 }, new { Name = "", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 50 }, new { Name = "tag6", Value = 60 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterOperator = FilterOperator.IsNotEmpty,
+                    CollectionFilterMode = CollectionFilterMode.Any
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where at least one tag has non-empty Name
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
+
+        [Fact]
+        public void Where_FiltersCollectionItemProperty_WithCollectionFilterMode_All_WithIsNotEmpty()
+        {
+            var testData = new[]
+            {
+                new { Id = 1, Tags = new[] { new { Name = "tag1", Value = 10 }, new { Name = "tag2", Value = 20 } }.ToList() },
+                new { Id = 2, Tags = new[] { new { Name = "tag3", Value = 30 }, new { Name = "", Value = 40 } }.ToList() },
+                new { Id = 3, Tags = new[] { new { Name = "tag5", Value = 50 } }.ToList() }
+            }.AsQueryable();
+
+            var filters = new List<FilterDescriptor>
+            {
+                new FilterDescriptor 
+                { 
+                    Property = "Tags",
+                    FilterProperty = "Name",
+                    FilterOperator = FilterOperator.IsNotEmpty,
+                    CollectionFilterMode = CollectionFilterMode.All
+                }
+            };
+            
+            var result = testData.Where(filters, LogicalFilterOperator.And, FilterCaseSensitivity.Default).ToList();
+            
+            // Should return items where all tags have non-empty Name
+            Assert.Equal(2, result.Count);
+            Assert.Contains(result, r => r.Id == 1);
+            Assert.Contains(result, r => r.Id == 3);
+        }
     }
 }
 

Radzen.Blazor.Tests/Radzen.Blazor.Tests.csproj

@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net9</TargetFramework>
-
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>disable</Nullable>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="bunit.web" Version="1.36.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">

Radzen.Blazor.Tests/SchedulerYearRangeTests.cs

@@ -0,0 +1,63 @@
+using Bunit;
+using Microsoft.JSInterop;
+using Microsoft.Extensions.DependencyInjection;
+using Radzen.Blazor;
+using Radzen.Blazor.Rendering;
+using Radzen;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class SchedulerYearRangeTests
+    {
+        class Appointment
+        {
+            public DateTime Start { get; set; }
+            public DateTime End { get; set; }
+            public string Text { get; set; } = "";
+        }
+
+        [Fact]
+        public void YearView_StartMonthJanuary_IncludesLastDaysOfYear_WhenYearStartsOnFirstDayOfWeek()
+        {
+            using var ctx = new TestContext();
+            ctx.JSInterop.Mode = JSRuntimeMode.Loose;
+            ctx.Services.AddScoped<DialogService>();
+            ctx.JSInterop.Setup<Rect>("Radzen.createScheduler", _ => true)
+                .SetResult(new Rect { Left = 0, Top = 0, Width = 200, Height = 200 });
+
+            // Make the first day of week Monday and use a year where Jan 1 is Monday (2024-01-01).
+            var culture = (CultureInfo)CultureInfo.InvariantCulture.Clone();
+            culture.DateTimeFormat.FirstDayOfWeek = DayOfWeek.Monday;
+
+            var appointments = new List<Appointment>
+            {
+                new() { Start = new DateTime(2024, 12, 31), End = new DateTime(2025, 1, 1), Text = "Year end" }
+            };
+
+            var cut = ctx.RenderComponent<RadzenScheduler<Appointment>>(p =>
+            {
+                p.Add(x => x.Culture, culture);
+                p.Add(x => x.Date, new DateTime(2024, 6, 1));
+                p.Add(x => x.Data, appointments);
+                p.Add(x => x.StartProperty, nameof(Appointment.Start));
+                p.Add(x => x.EndProperty, nameof(Appointment.End));
+                p.Add(x => x.TextProperty, nameof(Appointment.Text));
+                p.AddChildContent<RadzenYearView>(v => v.Add(x => x.StartMonth, Radzen.Month.January));
+            });
+
+            var view = Assert.IsType<RadzenYearView>(cut.Instance.SelectedView);
+
+            // View should start on 2023-12-25 (one extra week above since 2024-01-01 is Monday).
+            Assert.Equal(new DateTime(2023, 12, 25), view.StartDate.Date);
+
+            // View end must include 2024-12-31 (it should extend to end-of-week containing the real year end).
+            Assert.True(view.EndDate.Date >= new DateTime(2024, 12, 31), $"EndDate was {view.EndDate:yyyy-MM-dd}");
+        }
+    }
+}
+
+

Radzen.Blazor.Tests/SwitchTests.cs

@@ -110,7 +110,7 @@ namespace Radzen.Blazor.Tests
 
             component.SetParametersAndRender(parameters => parameters.Add(p => p.Change, args => { raised = true; newValue = args; }));
 
-            component.Find("div").Click();
+            component.Find("input[type=\"checkbox\"]").Click();
 
             Assert.True(raised);
             Assert.True(object.Equals(value, !(bool)newValue));
@@ -129,7 +129,7 @@ namespace Radzen.Blazor.Tests
 
             component.SetParametersAndRender(parameters => parameters.Add(p => p.ValueChanged, args => { raised = true; newValue = args; }));
 
-            component.Find("div").Click();
+            component.Find("input[type=\"checkbox\"]").Click();
 
             Assert.True(raised);
             Assert.True(object.Equals(value, !(bool)newValue));

Radzen.Blazor.Tests/TocTests.cs

@@ -0,0 +1,27 @@
+using Bunit;
+using System.Collections.Generic;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class TocTests
+    {
+        [Fact]
+        public void TocItem_Renders_With_Attributes()
+        {
+            using var ctx = new TestContext();
+            var component = ctx.RenderComponent<RadzenTocItem>(parameters =>
+            {
+                parameters.Add(p => p.Attributes, new Dictionary<string, object>
+                {
+                    { "data-enhance-nav", "false" },
+                    { "aria-label", "Table of Contents Item" }
+                });
+            });
+
+            Assert.Contains("data-enhance-nav=\"false\"", component.Markup);
+            Assert.Contains("aria-label=\"Table of Contents Item\"", component.Markup);
+        }
+    }
+}
+

Radzen.Blazor/.editorconfig

@@ -6,6 +6,48 @@ root = true
 
 #### Core EditorConfig Options ####
 
+dotnet_diagnostic.CA1002.severity = none
+dotnet_diagnostic.CA1003.severity = none
+dotnet_diagnostic.CA1024.severity = none
+dotnet_diagnostic.CA1030.severity = none
+dotnet_diagnostic.CA1031.severity = none
+dotnet_diagnostic.CA1033.severity = none
+dotnet_diagnostic.CA1044.severity = none
+dotnet_diagnostic.CA1050.severity = none
+dotnet_diagnostic.CA1051.severity = none
+dotnet_diagnostic.CA1052.severity = none
+dotnet_diagnostic.CA1054.severity = none
+dotnet_diagnostic.CA1055.severity = none
+dotnet_diagnostic.CA1056.severity = none
+dotnet_diagnostic.CA1063.severity = none
+dotnet_diagnostic.CA1068.severity = none
+dotnet_diagnostic.CA1308.severity = none
+dotnet_diagnostic.CA1708.severity = none
+dotnet_diagnostic.CA1711.severity = none
+dotnet_diagnostic.CA1716.severity = none
+dotnet_diagnostic.CA1720.severity = none
+dotnet_diagnostic.CA1721.severity = none
+dotnet_diagnostic.CA1724.severity = none
+dotnet_diagnostic.CA1725.severity = none
+dotnet_diagnostic.CA1802.severity = none
+dotnet_diagnostic.CA1814.severity = none
+dotnet_diagnostic.CA1815.severity = none
+dotnet_diagnostic.CA1816.severity = none
+dotnet_diagnostic.CA1819.severity = none
+dotnet_diagnostic.CA1822.severity = none
+dotnet_diagnostic.CA1827.severity = none
+dotnet_diagnostic.CA1834.severity = none
+dotnet_diagnostic.CA1845.severity = none
+dotnet_diagnostic.CA1849.severity = none
+dotnet_diagnostic.CA1851.severity = none
+dotnet_diagnostic.CA1859.severity = none
+dotnet_diagnostic.CA1863.severity = none
+dotnet_diagnostic.CA1869.severity = none
+dotnet_diagnostic.CA2007.severity = none
+dotnet_diagnostic.CA2012.severity = none
+dotnet_diagnostic.CA2211.severity = none
+dotnet_diagnostic.CA2227.severity = none
+
 # Indentation and spacing
 indent_size = 4
 indent_style = space

Radzen.Blazor/AIChatService.cs

@@ -10,206 +10,19 @@ using System.Text.Json.Serialization;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
 using System.Linq;
-using Radzen.Blazor;
 
 namespace Radzen;
 
-/// <summary>
-/// Represents a conversation session with memory.
-/// </summary>
-public class ConversationSession
-{
-    /// <summary>
-    /// Gets or sets the unique identifier for the conversation session.
-    /// </summary>
-    public string Id { get; set; } = Guid.NewGuid().ToString();
-
-    /// <summary>
-    /// Gets or sets the list of messages in the conversation.
-    /// </summary>
-    public List<ChatMessage> Messages { get; set; } = new();
-
-    /// <summary>
-    /// Gets or sets the timestamp when the conversation was created.
-    /// </summary>
-    public DateTime CreatedAt { get; set; } = DateTime.Now;
-
-    /// <summary>
-    /// Gets or sets the timestamp when the conversation was last updated.
-    /// </summary>
-    public DateTime LastUpdated { get; set; } = DateTime.Now;
-
-    /// <summary>
-    /// Gets or sets the maximum number of messages to keep in memory.
-    /// </summary>
-    public int MaxMessages { get; set; } = 50;
-
-    /// <summary>
-    /// Adds a message to the conversation and manages memory limits.
-    /// </summary>
-    /// <param name="role">The role of the message sender.</param>
-    /// <param name="content">The message content.</param>
-    public void AddMessage(string role, string content)
-    {
-        Messages.Add(new ChatMessage
-        {
-            UserId = role,
-            IsUser = role != "system",
-            Content = content,
-            Timestamp = DateTime.Now
-        });
-
-        LastUpdated = DateTime.Now;
-
-        // Remove oldest messages if we exceed the limit
-        while (Messages.Count > MaxMessages)
-        {
-            Messages.RemoveAt(0);
-        }
-    }
-
-    /// <summary>
-    /// Clears all messages from the conversation.
-    /// </summary>
-    public void Clear()
-    {
-        Messages.Clear();
-        LastUpdated = DateTime.Now;
-    }
-
-    /// <summary>
-    /// Gets the conversation messages formatted for the AI API.
-    /// </summary>
-    /// <param name="systemPrompt">The system prompt to include.</param>
-    /// <returns>A list of message objects for the AI API.</returns>
-    public List<object> GetFormattedMessages(string systemPrompt)
-    {
-        var messages = new List<object>();
-
-        // Add system message
-        messages.Add(new { role = "system", content = systemPrompt });
-
-        // Add conversation messages
-        foreach (var message in Messages)
-        {
-            messages.Add(new { role = message.IsUser ? "user" : "system", content = message.Content });
-        }
-
-        return messages;
-    }
-}
-
-/// <summary>
-/// Interface for getting chat completions from an AI model with conversation memory.
-/// </summary>
-public interface IAIChatService
-{
-    /// <summary>
-    /// Streams chat completion responses from the AI model asynchronously with conversation memory.
-    /// </summary>
-    /// <param name="userInput">The user's input message to send to the AI model.</param>
-    /// <param name="sessionId">Optional session ID to maintain conversation context. If null, a new session will be created.</param>
-    /// <param name="cancellationToken">A cancellation token that can be used to cancel the operation.</param>
-    /// <param name="model">Optional model name to override the configured model.</param>
-    /// <param name="systemPrompt">Optional system prompt to override the configured system prompt.</param>
-    /// <param name="temperature">Optional temperature to override the configured temperature.</param>
-    /// <param name="maxTokens">Optional maximum tokens to override the configured max tokens.</param>
-    /// <param name="endpoint">Optional endpoint URL to override the configured endpoint.</param>
-    /// <param name="proxy">Optional proxy URL to override the configured proxy.</param>
-    /// <param name="apiKey">Optional API key to override the configured API key.</param>
-    /// <param name="apiKeyHeader">Optional API key header name to override the configured header.</param>
-    /// <returns>An async enumerable that yields streaming response chunks from the AI model.</returns>
-    IAsyncEnumerable<string> GetCompletionsAsync(string userInput, string sessionId = null, CancellationToken cancellationToken = default, string model = null, string systemPrompt = null, double? temperature = null, int? maxTokens = null, string endpoint = null, string proxy = null, string apiKey = null, string apiKeyHeader = null);
-
-    /// <summary>
-    /// Gets or creates a conversation session.
-    /// </summary>
-    /// <param name="sessionId">The session ID. If null, a new session will be created.</param>
-    /// <returns>The conversation session.</returns>
-    ConversationSession GetOrCreateSession(string sessionId = null);
-
-    /// <summary>
-    /// Clears the conversation history for a specific session.
-    /// </summary>
-    /// <param name="sessionId">The session ID to clear.</param>
-    void ClearSession(string sessionId);
-
-    /// <summary>
-    /// Gets all active conversation sessions.
-    /// </summary>
-    /// <returns>A list of active conversation sessions.</returns>
-    IEnumerable<ConversationSession> GetActiveSessions();
-
-    /// <summary>
-    /// Removes old conversation sessions based on age.
-    /// </summary>
-    /// <param name="maxAgeHours">Maximum age in hours for sessions to keep.</param>
-    void CleanupOldSessions(int maxAgeHours = 24);
-}
-
-/// <summary>
-/// Configuration options for the <see cref="AIChatService"/>.
-/// </summary>
-public class AIChatServiceOptions
-{
-    /// <summary>
-    /// Gets or sets the endpoint URL for the AI service.
-    /// </summary>
-    public string Endpoint { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Gets or sets the proxy URL for the AI service, if any. If set, this will override the Endpoint.
-    /// </summary>
-    public string Proxy { get; set; } = null;
-
-    /// <summary>
-    /// Gets or sets the API key for authentication with the AI service.
-    /// </summary>
-    public string ApiKey { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Gets or sets the header name for the API key (e.g., 'Authorization' or 'api-key').
-    /// </summary>
-    public string ApiKeyHeader { get; set; } = "Authorization";
-
-    /// <summary>
-    /// Gets or sets the model name to use for executing chat completions (e.g., 'gpt-3.5-turbo').
-    /// </summary>
-    public string Model { get; set; }
-
-    /// <summary>
-    /// Gets or sets the system prompt for the AI assistant.
-    /// </summary>
-    public string SystemPrompt { get; set; } = "You are a helpful AI code assistant.";
-
-    /// <summary>
-    /// Gets or sets the temperature for the AI model (0.0 to 2.0). Set to 0.0 for deterministic responses, higher values for more creative outputs.
-    /// </summary>
-    public double Temperature { get; set; } = 0.7;
-
-    /// <summary>
-    /// Gets or sets the maximum number of tokens to generate in the response.
-    /// </summary>
-    public int? MaxTokens { get; set; }
-
-    /// <summary>
-    /// Gets or sets the maximum number of messages to keep in conversation memory.
-    /// </summary>
-    public int MaxMessages { get; set; } = 50;
-
-    /// <summary>
-    /// Gets or sets the maximum age in hours for conversation sessions before cleanup.
-    /// </summary>
-    public int SessionMaxAgeHours { get; set; } = 24;
-}
-
 /// <summary>
 /// Service for interacting with AI chat models to get completions with conversation memory.
 /// </summary>
 public class AIChatService(IServiceProvider serviceProvider, IOptions<AIChatServiceOptions> options) : IAIChatService
 {
-    private readonly Dictionary<string, ConversationSession> _sessions = new();
-    private readonly object _sessionsLock = new();
+    private readonly Dictionary<string, ConversationSession> sessions = new();
+    private readonly object sessionsLock = new();
+
+    // Add this static field to cache the JsonSerializerOptions instance
+    private static readonly JsonSerializerOptions CachedJsonSerializerOptions = new JsonSerializerOptions { DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull };
 
     /// <summary>
     /// Gets the configuration options for the chat streaming service.
@@ -217,7 +30,7 @@ public class AIChatService(IServiceProvider serviceProvider, IOptions<AIChatServ
     public AIChatServiceOptions Options => options.Value;
 
     /// <inheritdoc />
-    public async IAsyncEnumerable<string> GetCompletionsAsync(string userInput, string sessionId = null, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken = default, string model = null, string systemPrompt = null, double? temperature = null, int? maxTokens = null, string endpoint = null, string proxy = null, string apiKey = null, string apiKeyHeader = null)
+    public async IAsyncEnumerable<string> GetCompletionsAsync(string userInput, string? sessionId = null, [System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken cancellationToken = default, string? model = null, string? systemPrompt = null, double? temperature = null, int? maxTokens = null, string? endpoint = null, string? proxy = null, string? apiKey = null, string? apiKeyHeader = null)
     {
         if (string.IsNullOrWhiteSpace(userInput))
         {
@@ -226,7 +39,7 @@ public class AIChatService(IServiceProvider serviceProvider, IOptions<AIChatServ
 
         // Get or create session
         var session = GetOrCreateSession(sessionId);
-        
+
         // Add user message to conversation history
         session.AddMessage("user", userInput);
 
@@ -247,13 +60,18 @@ public class AIChatService(IServiceProvider serviceProvider, IOptions<AIChatServ
             stream = true
         };
 
-        var request = new HttpRequestMessage(HttpMethod.Post, url)
+        using var request = new HttpRequestMessage(HttpMethod.Post, url)
         {
-            Content = new StringContent(JsonSerializer.Serialize(payload, new JsonSerializerOptions { DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull }), Encoding.UTF8, "application/json")
+            Content = new StringContent(JsonSerializer.Serialize(payload, CachedJsonSerializerOptions), Encoding.UTF8, "application/json")
         };
 
         if (!string.IsNullOrEmpty(effectiveApiKey))
         {
+            if (string.IsNullOrWhiteSpace(effectiveApiKeyHeader))
+            {
+                throw new InvalidOperationException("API key header must be specified when an API key is provided.");
+            }
+
             if (string.Equals(effectiveApiKeyHeader, "Authorization", StringComparison.OrdinalIgnoreCase))
             {
                 request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", effectiveApiKey);
@@ -265,23 +83,22 @@ public class AIChatService(IServiceProvider serviceProvider, IOptions<AIChatServ
         }
 
         var httpClient = serviceProvider.GetRequiredService<HttpClient>();
-        var response = await httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
+        var response = await httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
 
         if (!response.IsSuccessStatusCode)
         {
-            throw new Exception($"Chat stream failed: {await response.Content.ReadAsStringAsync(cancellationToken)}");
+            throw new HttpRequestException($"Chat stream failed: {await response.Content.ReadAsStringAsync(cancellationToken).ConfigureAwait(false)}");
         }
 
-        using var stream = await response.Content.ReadAsStreamAsync(cancellationToken);
+        using var stream = await response.Content.ReadAsStreamAsync(cancellationToken).ConfigureAwait(false);
         using var reader = new StreamReader(stream);
 
         var assistantResponse = new StringBuilder();
 
-        while (!reader.EndOfStream && !cancellationToken.IsCancellationRequested)
+        string? line;
+        while ((line = await reader.ReadLineAsync()) is not null && !cancellationToken.IsCancellationRequested)
         {
-            var line = await reader.ReadLineAsync();
-
-            if (string.IsNullOrWhiteSpace(line) || !line.StartsWith("data:"))
+            if (string.IsNullOrWhiteSpace(line) || !line.StartsWith("data:", StringComparison.Ordinal))
             {
                 continue;
             }
@@ -309,23 +126,23 @@ public class AIChatService(IServiceProvider serviceProvider, IOptions<AIChatServ
     }
 
     /// <inheritdoc />
-    public ConversationSession GetOrCreateSession(string sessionId = null)
+    public ConversationSession GetOrCreateSession(string? sessionId = null)
     {
-        lock (_sessionsLock)
+        lock (sessionsLock)
         {
             if (string.IsNullOrEmpty(sessionId))
             {
                 sessionId = Guid.NewGuid().ToString();
             }
 
-            if (!_sessions.TryGetValue(sessionId, out var session))
+            if (!sessions.TryGetValue(sessionId, out var session))
             {
                 session = new ConversationSession
                 {
                     Id = sessionId,
                     MaxMessages = Options.MaxMessages
                 };
-                _sessions[sessionId] = session;
+                sessions[sessionId] = session;
             }
 
             return session;
@@ -335,9 +152,9 @@ public class AIChatService(IServiceProvider serviceProvider, IOptions<AIChatServ
     /// <inheritdoc />
     public void ClearSession(string sessionId)
     {
-        lock (_sessionsLock)
+        lock (sessionsLock)
         {
-            if (_sessions.TryGetValue(sessionId, out var session))
+            if (sessions.TryGetValue(sessionId, out var session))
             {
                 session.Clear();
             }
@@ -347,35 +164,40 @@ public class AIChatService(IServiceProvider serviceProvider, IOptions<AIChatServ
     /// <inheritdoc />
     public IEnumerable<ConversationSession> GetActiveSessions()
     {
-        lock (_sessionsLock)
+        lock (sessionsLock)
         {
-            return _sessions.Values.ToList();
+            return sessions.Values.ToList();
         }
     }
 
     /// <inheritdoc />
     public void CleanupOldSessions(int maxAgeHours = 24)
     {
-        lock (_sessionsLock)
+        lock (sessionsLock)
         {
             var cutoffTime = DateTime.Now.AddHours(-maxAgeHours);
-            var sessionsToRemove = _sessions.Values
+            var sessionsToRemove = sessions.Values
                 .Where(s => s.LastUpdated < cutoffTime)
                 .Select(s => s.Id)
                 .ToList();
 
             foreach (var sessionId in sessionsToRemove)
             {
-                _sessions.Remove(sessionId);
+                sessions.Remove(sessionId);
             }
         }
     }
 
     private static string ParseStreamingResponse(string json)
     {
+        if (string.IsNullOrWhiteSpace(json))
+        {
+            return string.Empty;
+        }
+
         try
         {
-            var doc = JsonDocument.Parse(json);
+            using var doc = JsonDocument.Parse(json);
             var root = doc.RootElement;
 
             if (!root.TryGetProperty("choices", out var choices) || choices.GetArrayLength() == 0)
@@ -397,52 +219,13 @@ public class AIChatService(IServiceProvider serviceProvider, IOptions<AIChatServ
 
             return string.Empty;
         }
-        catch
+        catch (JsonException)
+        {
+            return string.Empty;
+        }
+        catch (FormatException)
         {
             return string.Empty;
         }
     }
 }
-
-/// <summary>
-/// Extension methods for configuring AIChatService in the dependency injection container.
-/// </summary>
-public static class AIChatServiceExtensions
-{
-    /// <summary>
-    /// Adds the AIChatService to the service collection with the specified configuration.
-    /// </summary>
-    /// <param name="services">The service collection.</param>
-    /// <param name="configureOptions">The action to configure the AIChatService options.</param>
-    /// <returns>The updated service collection.</returns>
-    public static IServiceCollection AddAIChatService(this IServiceCollection services, Action<AIChatServiceOptions> configureOptions)
-    {
-        if (services == null)
-        {
-            throw new ArgumentNullException(nameof(services));
-        }
-
-        if (configureOptions == null)
-        {
-            throw new ArgumentNullException(nameof(configureOptions));
-        }
-
-        services.Configure(configureOptions);
-        services.AddScoped<IAIChatService, AIChatService>();
-
-        return services;
-    }
-
-    /// <summary>
-    /// Adds the AIChatService to the service collection with default options.
-    /// </summary>
-    /// <param name="services">The service collection.</param>
-    /// <returns>The updated service collection.</returns>
-    public static IServiceCollection AddAIChatService(this IServiceCollection services)
-    {
-        services.AddOptions<AIChatServiceOptions>();
-        services.AddScoped<IAIChatService, AIChatService>();
-
-        return services;
-    }
-}

Radzen.Blazor/AIChatServiceExtensions.cs

@@ -0,0 +1,41 @@
+using System;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Radzen;
+
+/// <summary>
+/// Extension methods for configuring AIChatService in the dependency injection container.
+/// </summary>
+public static class AIChatServiceExtensions
+{
+    /// <summary>
+    /// Adds the AIChatService to the service collection with the specified configuration.
+    /// </summary>
+    /// <param name="services">The service collection.</param>
+    /// <param name="configureOptions">The action to configure the AIChatService options.</param>
+    /// <returns>The updated service collection.</returns>
+    public static IServiceCollection AddAIChatService(this IServiceCollection services, Action<AIChatServiceOptions> configureOptions)
+    {
+        ArgumentNullException.ThrowIfNull(services);
+        ArgumentNullException.ThrowIfNull(configureOptions);
+
+        services.Configure(configureOptions);
+        services.AddScoped<IAIChatService, AIChatService>();
+
+        return services;
+    }
+
+    /// <summary>
+    /// Adds the AIChatService to the service collection with default options.
+    /// </summary>
+    /// <param name="services">The service collection.</param>
+    /// <returns>The updated service collection.</returns>
+    public static IServiceCollection AddAIChatService(this IServiceCollection services)
+    {
+        services.AddOptions<AIChatServiceOptions>();
+        services.AddScoped<IAIChatService, AIChatService>();
+
+        return services;
+    }
+}
+

Radzen.Blazor/AIChatServiceOptions.cs

@@ -0,0 +1,58 @@
+namespace Radzen;
+
+/// <summary>
+/// Configuration options for the <see cref="AIChatService"/>.
+/// </summary>
+public class AIChatServiceOptions
+{
+    /// <summary>
+    /// Gets or sets the endpoint URL for the AI service.
+    /// </summary>
+    public string Endpoint { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the proxy URL for the AI service, if any. If set, this will override the Endpoint.
+    /// </summary>
+    public string? Proxy { get; set; }
+
+    /// <summary>
+    /// Gets or sets the API key for authentication with the AI service.
+    /// </summary>
+    public string ApiKey { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the header name for the API key (e.g., 'Authorization' or 'api-key').
+    /// </summary>
+    public string ApiKeyHeader { get; set; } = "Authorization";
+
+    /// <summary>
+    /// Gets or sets the model name to use for executing chat completions (e.g., 'gpt-3.5-turbo').
+    /// </summary>
+    public string? Model { get; set; }
+
+    /// <summary>
+    /// Gets or sets the system prompt for the AI assistant.
+    /// </summary>
+    public string SystemPrompt { get; set; } = "You are a helpful AI code assistant.";
+
+    /// <summary>
+    /// Gets or sets the temperature for the AI model (0.0 to 2.0). Set to 0.0 for deterministic responses, higher values for more creative outputs.
+    /// </summary>
+    public double Temperature { get; set; } = 0.7;
+
+    /// <summary>
+    /// Gets or sets the maximum number of tokens to generate in the response.
+    /// </summary>
+    public int? MaxTokens { get; set; }
+
+    /// <summary>
+    /// Gets or sets the maximum number of messages to keep in conversation memory.
+    /// </summary>
+    public int MaxMessages { get; set; } = 50;
+
+    /// <summary>
+    /// Gets or sets the maximum age in hours for conversation sessions before cleanup.
+    /// </summary>
+    public int SessionMaxAgeHours { get; set; } = 24;
+}
+

Radzen.Blazor/AggregateFunction.cs

@@ -0,0 +1,43 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the aggregate function for pivot values.
+/// </summary>
+public enum AggregateFunction
+{
+    /// <summary>
+    /// Sum of values.
+    /// </summary>
+    Sum,
+
+    /// <summary>
+    /// Count of items.
+    /// </summary>
+    Count,
+
+    /// <summary>
+    /// Average of values.
+    /// </summary>
+    Average,
+
+    /// <summary>
+    /// Minimum value.
+    /// </summary>
+    Min,
+
+    /// <summary>
+    /// Maximum value.
+    /// </summary>
+    Max,
+
+    /// <summary>
+    /// First value.
+    /// </summary>
+    First,
+
+    /// <summary>
+    /// Last value.
+    /// </summary>
+    Last
+}
+

Radzen.Blazor/AlertSize.cs

@@ -0,0 +1,28 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the size of a <see cref="Radzen.Blazor.RadzenAlert" />.
+/// </summary>
+public enum AlertSize
+{
+    /// <summary>
+    /// The smallest alert.
+    /// </summary>
+    ExtraSmall,
+
+    /// <summary>
+    /// A alert smaller than the default.
+    /// </summary>
+    Small,
+
+    /// <summary>
+    /// The default size of an alert.
+    /// </summary>
+    Medium,
+
+    /// <summary>
+    /// An alert larger than the default.
+    /// </summary>
+    Large
+}
+

Radzen.Blazor/AlertStyle.cs

@@ -0,0 +1,53 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the display style or severity of a <see cref="Radzen.Blazor.RadzenAlert" />. Affects the visual styling of RadzenAlert (background and text color).
+/// </summary>
+public enum AlertStyle
+{
+    /// <summary>
+    /// Primary styling. Similar to primary buttons.
+    /// </summary>
+    Primary,
+
+    /// <summary>
+    /// Secondary styling. Similar to secondary buttons.
+    /// </summary>
+    Secondary,
+
+    /// <summary>
+    /// Light styling. Similar to light buttons.
+    /// </summary>
+    Light,
+
+    /// <summary>
+    /// Base styling. Similar to base buttons.
+    /// </summary>
+    Base,
+
+    /// <summary>
+    /// Dark styling. Similar to dark buttons.
+    /// </summary>
+    Dark,
+
+    /// <summary>
+    /// Success styling.
+    /// </summary>
+    Success,
+
+    /// <summary>
+    /// Danger styling.
+    /// </summary>
+    Danger,
+
+    /// <summary>
+    /// Warning styling.
+    /// </summary>
+    Warning,
+
+    /// <summary>
+    /// Informative styling.
+    /// </summary>
+    Info
+}
+

Radzen.Blazor/AlignItems.cs

@@ -0,0 +1,33 @@
+namespace Radzen;
+
+/// <summary>
+/// Represents the alignment of Stack items.
+/// </summary>
+public enum AlignItems
+{
+    /// <summary>
+    /// Normal items alignment.
+    /// </summary>
+    Normal,
+
+    /// <summary>
+    /// Center items alignment.
+    /// </summary>
+    Center,
+
+    /// <summary>
+    /// Start items alignment.
+    /// </summary>
+    Start,
+
+    /// <summary>
+    /// End items alignment.
+    /// </summary>
+    End,
+
+    /// <summary>
+    /// Stretch items alignment.
+    /// </summary>
+    Stretch
+}
+

Radzen.Blazor/AppointmentData.cs

@@ -22,19 +22,19 @@ namespace Radzen.Blazor
         /// Gets or sets the text of the appointment.
         /// </summary>
         /// <value>The text.</value>
-        public string Text { get; set; }
+        public string? Text { get; set; }
         /// <summary>
         /// Gets or sets the data associated with the appointment
         /// </summary>
         /// <value>The data.</value>
-        public object Data { get; set; }
+        public object? Data { get; set; }
 
         /// <summary>
         /// Determines whether the specified object is equal to this instance. Used to check if two appointments are equal.
         /// </summary>
         /// <param name="obj">The object to compare with this instance.</param>
         /// <returns><c>true</c> if the specified is equal to this instance; otherwise, <c>false</c>.</returns>
-        public override bool Equals(object obj)
+        public override bool Equals(object? obj)
         {
             return obj is AppointmentData data &&
                    Start == data.Start &&

Radzen.Blazor/AxisBase.cs

@@ -13,7 +13,7 @@ namespace Radzen.Blazor
         /// </summary>
         /// <value>The stroke.</value>
         [Parameter]
-        public string Stroke { get; set; }
+        public string? Stroke { get; set; }
         /// <summary>
         /// Gets or sets the pixel width of axis.
         /// </summary>
@@ -26,21 +26,21 @@ namespace Radzen.Blazor
         /// </summary>
         /// <value>The child content.</value>
         [Parameter]
-        public RenderFragment ChildContent { get; set; }
+        public RenderFragment? ChildContent { get; set; }
 
         /// <summary>
         /// Gets or sets the format string used to display the axis values.
         /// </summary>
         /// <value>The format string.</value>
         [Parameter]
-        public string FormatString { get; set; }
+        public string? FormatString { get; set; }
 
         /// <summary>
         /// Gets or sets a formatter function that formats the axis values.
         /// </summary>
         /// <value>The formatter.</value>
         [Parameter]
-        public Func<object, string> Formatter { get; set; }
+        public Func<object, string>? Formatter { get; set; }
 
         /// <summary>
         /// Gets or sets the type of the line used to display the axis.
@@ -80,20 +80,20 @@ namespace Radzen.Blazor
         /// </summary>
         /// <value>The minimum.</value>
         [Parameter]
-        public object Min { get; set; }
+        public object? Min { get; set; }
 
         /// <summary>
         /// Specifies the maximum value of the axis.
         /// </summary>
         /// <value>The maximum.</value>
         [Parameter]
-        public object Max { get; set; }
+        public object? Max { get; set; }
 
         /// <summary>
         /// Specifies the step of the axis.
         /// </summary>
         [Parameter]
-        public object Step { get; set; }
+        public object? Step { get; set; }
 
         /// <summary>
         /// Gets or sets a value indicating whether this <see cref="AxisBase"/> is visible.
@@ -139,7 +139,7 @@ namespace Radzen.Blazor
             }
             else
             {
-                return scale.FormatTick(FormatString, value);
+                return scale.FormatTick(FormatString ?? string.Empty, value);
             }
         }
 

Radzen.Blazor/BadgeStyle.cs

@@ -0,0 +1,53 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the display style of a <see cref="Radzen.Blazor.RadzenBadge" />. Affects the visual styling of RadzenBadge (background and text color).
+/// </summary>
+public enum BadgeStyle
+{
+    /// <summary>
+    /// Primary styling. Similar to primary buttons.
+    /// </summary>
+    Primary,
+
+    /// <summary>
+    /// Secondary styling. Similar to secondary buttons.
+    /// </summary>
+    Secondary,
+
+    /// <summary>
+    /// Light styling. Similar to light buttons.
+    /// </summary>
+    Light,
+
+    /// <summary>
+    /// Base styling. Similar to base buttons.
+    /// </summary>
+    Base,
+
+    /// <summary>
+    /// Dark styling. Similar to dark buttons.
+    /// </summary>
+    Dark,
+
+    /// <summary>
+    /// Success styling.
+    /// </summary>
+    Success,
+
+    /// <summary>
+    /// Danger styling.
+    /// </summary>
+    Danger,
+
+    /// <summary>
+    /// Warning styling.
+    /// </summary>
+    Warning,
+
+    /// <summary>
+    /// Informative styling.
+    /// </summary>
+    Info
+}
+

Radzen.Blazor/ButtonSize.cs

@@ -0,0 +1,28 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the size of a <see cref="Radzen.Blazor.RadzenButton" />.
+/// </summary>
+public enum ButtonSize
+{
+    /// <summary>
+    /// The default size of a button.
+    /// </summary>
+    Medium,
+
+    /// <summary>
+    /// A button larger than the default.
+    /// </summary>
+    Large,
+
+    /// <summary>
+    /// A button smaller than the default.
+    /// </summary>
+    Small,
+
+    /// <summary>
+    /// The smallest button.
+    /// </summary>
+    ExtraSmall
+}
+

Radzen.Blazor/ButtonStyle.cs

@@ -0,0 +1,53 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the display style of a <see cref="Radzen.Blazor.RadzenButton" />. Affects the visual styling of RadzenButton (background and text color).
+/// </summary>
+public enum ButtonStyle
+{
+    /// <summary>
+    /// A primary button. Clicking it performs the primary action in a form or dialog (e.g. "save").
+    /// </summary>
+    Primary,
+
+    /// <summary>
+    /// A secondary button. Clicking it performs a secondary action in a form or dialog (e.g. close a dialog or cancel a form).
+    /// </summary>
+    Secondary,
+
+    /// <summary>
+    /// A button with lighter styling.
+    /// </summary>
+    Light,
+
+    /// <summary>
+    /// The base UI styling.
+    /// </summary>
+    Base,
+
+    /// <summary>
+    /// A button with dark styling.
+    /// </summary>
+    Dark,
+
+    /// <summary>
+    /// A button with success styling.
+    /// </summary>
+    Success,
+
+    /// <summary>
+    /// A button which represents a dangerous action e.g. "delete".
+    /// </summary>
+    Danger,
+
+    /// <summary>
+    /// A button with warning styling.
+    /// </summary>
+    Warning,
+
+    /// <summary>
+    /// A button with informative styling.
+    /// </summary>
+    Info
+}
+

Radzen.Blazor/ButtonType.cs

@@ -0,0 +1,23 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the type of a <see cref="Radzen.Blazor.RadzenButton" />. Renders as the <c>type</c> HTML attribute.
+/// </summary>
+public enum ButtonType
+{
+    /// <summary>
+    /// Generic button which does not submit its parent form.
+    /// </summary>
+    Button,
+
+    /// <summary>
+    /// Clicking a submit button submits its parent form.
+    /// </summary>
+    Submit,
+
+    /// <summary>
+    /// Clicking a reset button clears the value of all inputs in its parent form.
+    /// </summary>
+    Reset
+}
+

Radzen.Blazor/CartesianSeries.cs

@@ -19,7 +19,17 @@ namespace Radzen.Blazor
         /// Cache for the value returned by <see cref="Category"/> when that value is only dependent on
         /// <see cref="CategoryProperty"/>.
         /// </summary>
-        Func<TItem, double> categoryPropertyCache;
+        Func<TItem, double>? categoryPropertyCache;
+
+        /// <summary>
+        /// Returns the parent <see cref="RadzenChart"/> instance or throws an <see cref="InvalidOperationException"/> if not present.
+        /// </summary>
+        /// <returns>The parent <see cref="RadzenChart"/>.</returns>
+        /// <exception cref="InvalidOperationException">Thrown when the parent chart is not set.</exception>
+        protected RadzenChart RequireChart()
+        {
+            return Chart ?? throw new InvalidOperationException($"{GetType().Name} requires a parent RadzenChart.");
+        }
 
         /// <summary>
         /// Creates a getter function that returns a value from the specified category scale for the specified data item.
@@ -34,13 +44,13 @@ namespace Radzen.Blazor
 
             if (IsNumeric(CategoryProperty))
             {
-                categoryPropertyCache = PropertyAccess.Getter<TItem, double>(CategoryProperty);
+                categoryPropertyCache = PropertyAccess.Getter<TItem, double>(CategoryProperty!);
                 return categoryPropertyCache;
             }
 
             if (IsDate(CategoryProperty))
             {
-                var category = PropertyAccess.Getter<TItem, DateTime>(CategoryProperty);
+                var category = PropertyAccess.Getter<TItem, DateTime>(CategoryProperty!);
                 categoryPropertyCache = (item) => category(item).Ticks;
                 return categoryPropertyCache;
             }
@@ -49,7 +59,7 @@ namespace Radzen.Blazor
             {
                 Func<TItem, object> category = String.IsNullOrEmpty(CategoryProperty) ? (item) => string.Empty : PropertyAccess.Getter<TItem, object>(CategoryProperty);
 
-                return (item) => ordinal.Data.IndexOf(category(item));
+                return (item) => ordinal.Data?.IndexOf(category(item)) ?? -1;
             }
 
             return (item) => Items.IndexOf(item);
@@ -60,6 +70,8 @@ namespace Radzen.Blazor
         /// </summary>
         protected Func<TItem, double> ComposeCategory(ScaleBase scale)
         {
+            ArgumentNullException.ThrowIfNull(scale);
+
             return scale.Compose(Category(scale));
         }
 
@@ -68,6 +80,8 @@ namespace Radzen.Blazor
         /// </summary>
         protected Func<TItem, double> ComposeValue(ScaleBase scale)
         {
+            ArgumentNullException.ThrowIfNull(scale);
+
             return scale.Compose(Value);
         }
 
@@ -77,7 +91,7 @@ namespace Radzen.Blazor
         /// <param name="propertyName">Name of the property.</param>
         /// <returns><c>true</c> if the specified property name is date; otherwise, <c>false</c>.</returns>
         /// <exception cref="ArgumentException">Property {propertyName} does not exist</exception>
-        protected bool IsDate(string propertyName)
+        protected bool IsDate(string? propertyName)
         {
             if (String.IsNullOrEmpty(propertyName))
             {
@@ -91,12 +105,10 @@ namespace Radzen.Blazor
                 throw new ArgumentException($"Property {propertyName} does not exist");
             }
 
-#if NET6_0_OR_GREATER
             if(PropertyAccess.IsDateOnly(property))
             {
                 return false;
             }
-#endif
             return PropertyAccess.IsDate(property);
         }
 
@@ -106,7 +118,7 @@ namespace Radzen.Blazor
         /// <param name="propertyName">Name of the property.</param>
         /// <returns><c>true</c> if the specified property name is numeric; otherwise, <c>false</c>.</returns>
         /// <exception cref="ArgumentException">Property {propertyName} does not exist</exception>
-        protected bool IsNumeric(string propertyName)
+        protected bool IsNumeric(string? propertyName)
         {
             if (String.IsNullOrEmpty(propertyName))
             {
@@ -125,21 +137,21 @@ namespace Radzen.Blazor
 
         /// <inheritdoc />
         [Parameter]
-        public string Title { get; set; }
+        public string Title { get; set; } = null!;
 
         /// <summary>
         /// Gets or sets the child content.
         /// </summary>
         /// <value>The child content.</value>
         [Parameter]
-        public RenderFragment ChildContent { get; set; }
+        public RenderFragment? ChildContent { get; set; }
 
         /// <summary>
         /// Gets or sets the tooltip template.
         /// </summary>
         /// <value>The tooltip template.</value>
         [Parameter]
-        public RenderFragment<TItem> TooltipTemplate { get; set; }
+        public RenderFragment<TItem>? TooltipTemplate { get; set; }
 
         /// <summary>
         /// Gets the list of overlays.
@@ -157,7 +169,7 @@ namespace Radzen.Blazor
         /// The name of the property of <typeparamref name="TItem" /> that provides the X axis (a.k.a. category axis) values.
         /// </summary>
         [Parameter]
-        public string CategoryProperty { get; set; }
+        public string? CategoryProperty { get; set; }
 
         /// <summary>
         /// Gets or sets a value indicating whether this <see cref="CartesianSeries{TItem}"/> is visible.
@@ -194,7 +206,7 @@ namespace Radzen.Blazor
         /// The name of the property of <typeparamref name="TItem" /> that provides the Y axis (a.k.a. value axis) values.
         /// </summary>
         [Parameter]
-        public string ValueProperty { get; set; }
+        public string? ValueProperty { get; set; }
 
         /// <inheritdoc />
         [Parameter]
@@ -223,7 +235,7 @@ namespace Radzen.Blazor
         /// </summary>
         /// <value>The data.</value>
         [Parameter]
-        public IEnumerable<TItem> Data { get; set; }
+        public IEnumerable<TItem>? Data { get; set; }
 
         /// <summary>
         /// Stores <see cref="Data" /> as an IList of <typeparamref name="TItem"/>.
@@ -272,6 +284,8 @@ namespace Radzen.Blazor
         /// <inheritdoc />
         public virtual ScaleBase TransformCategoryScale(ScaleBase scale)
         {
+            ArgumentNullException.ThrowIfNull(scale);
+
             if (Items == null)
             {
                 return scale;
@@ -298,7 +312,7 @@ namespace Radzen.Blazor
 
             var data = GetCategories();
 
-            if (scale is OrdinalScale ordinal)
+            if (scale is OrdinalScale ordinal && ordinal.Data != null)
             {
                 foreach (var item in ordinal.Data)
                 {
@@ -328,6 +342,8 @@ namespace Radzen.Blazor
         /// <inheritdoc />
         public virtual ScaleBase TransformValueScale(ScaleBase scale)
         {
+            ArgumentNullException.ThrowIfNull(scale);
+
             if (Items != null)
             {
                 if (Items.Any())
@@ -398,29 +414,32 @@ namespace Radzen.Blazor
             {
                 if (Data != null)
                 {
-                    if (Data is IList<TItem>)
+                    if (Data is IList<TItem> list)
                     {
-                        Items = Data as IList<TItem>;
+                        Items = list;
                     }
                     else
                     {
                         Items = Data.ToList();
                     }
 
-                    if (IsDate(CategoryProperty) || IsNumeric(CategoryProperty))
+                    if (!string.IsNullOrEmpty(CategoryProperty) && (IsDate(CategoryProperty) || IsNumeric(CategoryProperty)))
                     {
                         Items = Items.AsQueryable().OrderBy(CategoryProperty).ToList();
                     }
                 }
 
-                await Chart.Refresh(false);
+                if (Chart != null)
+                {
+                    await Chart.Refresh(false);
+                }
             }
         }
 
         /// <inheritdoc />
         protected override void Initialize()
         {
-            Chart.AddSeries(this);
+            Chart?.AddSeries(this);
         }
 
         /// <inheritdoc />
@@ -443,6 +462,9 @@ namespace Radzen.Blazor
         /// <returns><c>true</c> if the polygon contains the point, <c>false</c> otherwise.</returns>
         protected bool InsidePolygon(Point point, Point[] polygon)
         {
+            ArgumentNullException.ThrowIfNull(point);
+            ArgumentNullException.ThrowIfNull(polygon);
+
             var minX = polygon[0].X;
             var maxX = polygon[0].X;
             var minY = polygon[0].Y;
@@ -479,18 +501,22 @@ namespace Radzen.Blazor
         /// <inheritdoc />
         public virtual RenderFragment RenderTooltip(object data)
         {
+            var chart = RequireChart();
             var item = (TItem)data;
-            
+
             return builder =>
             {
-                if (Chart.Tooltip.Shared)
+                if (chart.Tooltip.Shared)
                 {
-                    var category = PropertyAccess.GetValue(item, CategoryProperty);
-                    builder.OpenComponent<ChartSharedTooltip>(0);
-                    builder.AddAttribute(1, nameof(ChartSharedTooltip.Class), TooltipClass(item));
-                    builder.AddAttribute(2, nameof(ChartSharedTooltip.Title), TooltipTitle(item));
-                    builder.AddAttribute(3, nameof(ChartSharedTooltip.ChildContent), RenderSharedTooltipItems(category));
-                    builder.CloseComponent();
+                    var category = !string.IsNullOrEmpty(CategoryProperty) ? PropertyAccess.GetValue(item, CategoryProperty) : null;
+                    if (category != null)
+                    {
+                        builder.OpenComponent<ChartSharedTooltip>(0);
+                        builder.AddAttribute(1, nameof(ChartSharedTooltip.Class), TooltipClass(item));
+                        builder.AddAttribute(2, nameof(ChartSharedTooltip.Title), TooltipTitle(item));
+                        builder.AddAttribute(3, nameof(ChartSharedTooltip.ChildContent), RenderSharedTooltipItems(category));
+                        builder.CloseComponent();
+                    }
                 }
                 else
                 {
@@ -508,9 +534,11 @@ namespace Radzen.Blazor
 
         private RenderFragment RenderSharedTooltipItems(object category)
         {
+            var chart = RequireChart();
+
             return builder =>
             {
-                var visibleSeries = Chart.Series.Where(s => s.Visible).ToList();
+                var visibleSeries = chart.Series.Where(s => s.Visible).ToList();
 
                 foreach (var series in visibleSeries)
                 {
@@ -524,7 +552,7 @@ namespace Radzen.Blazor
         {
             return builder =>
             {
-                var item = Items.FirstOrDefault(i => object.Equals(PropertyAccess.GetValue(i, CategoryProperty), category));
+                var item = Items.FirstOrDefault(i => !string.IsNullOrEmpty(CategoryProperty) && object.Equals(PropertyAccess.GetValue(i, CategoryProperty), category));
 
                 if (item != null)
                 {
@@ -553,7 +581,7 @@ namespace Radzen.Blazor
         /// <param name="item">The item.</param>
         protected virtual string TooltipStyle(TItem item)
         {
-            return Chart.Tooltip.Style;
+            return Chart?.Tooltip?.Style ?? string.Empty;
         }
 
         /// <summary>
@@ -562,7 +590,13 @@ namespace Radzen.Blazor
         /// <param name="item">The item.</param>
         protected virtual string TooltipClass(TItem item)
         {
-            return $"rz-series-{Chart.Series.IndexOf(this)}-tooltip";
+            var chart = Chart;
+            if (chart == null)
+            {
+                return "rz-series-tooltip";
+            }
+
+            return $"rz-series-{chart.Series.IndexOf(this)}-tooltip";
         }
 
         /// <inheritdoc />
@@ -576,6 +610,8 @@ namespace Radzen.Blazor
         /// </summary>
         protected virtual RenderFragment RenderLegendItem(bool clickable)
         {
+            var chart = RequireChart();
+            var index = chart.Series.IndexOf(this);
             var style = new List<string>();
 
             if (IsVisible == false)
@@ -586,7 +622,7 @@ namespace Radzen.Blazor
             return builder =>
             {
                 builder.OpenComponent<LegendItem>(0);
-                builder.AddAttribute(1, nameof(LegendItem.Index), Chart.Series.IndexOf(this));
+                builder.AddAttribute(1, nameof(LegendItem.Index), index);
                 builder.AddAttribute(2, nameof(LegendItem.Color), Color);
                 builder.AddAttribute(3, nameof(LegendItem.MarkerType), MarkerType);
                 builder.AddAttribute(4, nameof(LegendItem.Style), string.Join(";", style));
@@ -617,19 +653,35 @@ namespace Radzen.Blazor
         /// <inheritdoc />
         public double GetMedian()
         {
-            return Data.Select(e => Value(e)).OrderBy(e => e).Skip(Data.Count() / 2).FirstOrDefault();
+            var values = Items.Select(Value).OrderBy(e => e).ToList();
+            if (values.Count == 0)
+            {
+                return 0;
+            }
+
+            return values[values.Count / 2];
         }
 
         /// <inheritdoc />
         public double GetMean()
         {
-            return Data.Select(e => Value(e)).DefaultIfEmpty(double.NaN).Average();
+            return Items.Any() ? Items.Select(Value).Average() : double.NaN;
         }
 
         /// <inheritdoc />
         public double GetMode()
         {
-            return Data.Any() ? Data.GroupBy(e => Value(e)).Select(g => new { Value = g.Key, Count = g.Count() }).OrderByDescending(e => e.Count).FirstOrDefault().Value : double.NaN;
+            if (!Items.Any())
+            {
+                return double.NaN;
+            }
+
+            return Items
+                .GroupBy(item => Value(item))
+                .Select(g => new { Value = g.Key, Count = g.Count() })
+                .OrderByDescending(e => e.Count)
+                .First()
+                .Value;
         }
 
         /// <summary>
@@ -639,33 +691,43 @@ namespace Radzen.Blazor
         {
             double a = double.NaN, b = double.NaN;
 
-            if (Data.Any())
+            var chart = Chart;
+            if (chart == null)
+            {
+                return (a, b);
+            }
+
+            if (Items.Any())
             {
                 Func<TItem, double> X;
                 Func<TItem, double> Y;
-                if (Chart.ShouldInvertAxes())
+                if (chart.ShouldInvertAxes())
                 {
-                    X = e => Chart.CategoryScale.Scale(Value(e));
-                    Y = e => Chart.ValueScale.Scale(Category(Chart.ValueScale)(e));
+                    var valueScale = chart.ValueScale;
+                    var categoryAccessor = Category(chart.ValueScale);
+                    X = e => chart.CategoryScale.Scale(Value(e));
+                    Y = e => valueScale.Scale(categoryAccessor(e));
                 }
                 else
                 {
-                    X = e => Chart.CategoryScale.Scale(Category(Chart.CategoryScale)(e));
-                    Y = e => Chart.ValueScale.Scale(Value(e));
+                    var categoryAccessor = Category(chart.CategoryScale);
+                    X = e => chart.CategoryScale.Scale(categoryAccessor(e));
+                    Y = e => chart.ValueScale.Scale(Value(e));
                 }
 
-                var avgX = Data.Select(e => X(e)).Average();
-                var avgY = Data.Select(e => Y(e)).Average();
-                var sumXY = Data.Sum(e => (X(e) - avgX) * (Y(e) - avgY));
-                if (Chart.ShouldInvertAxes())
+                var data = Items.ToList();
+                var avgX = data.Select(e => X(e)).Average();
+                var avgY = data.Select(e => Y(e)).Average();
+                var sumXY = data.Sum(e => (X(e) - avgX) * (Y(e) - avgY));
+                if (chart.ShouldInvertAxes())
                 {
-                    var sumYSq = Data.Sum(e => (Y(e) - avgY) * (Y(e) - avgY));
+                    var sumYSq = data.Sum(e => (Y(e) - avgY) * (Y(e) - avgY));
                     b = sumXY / sumYSq;
                     a = avgX - b * avgY;
                 }
                 else
                 {
-                    var sumXSq = Data.Sum(e => (X(e) - avgX) * (X(e) - avgX));
+                    var sumXSq = data.Sum(e => (X(e) - avgX) * (X(e) - avgX));
                     b = sumXY / sumXSq;
                     a = avgY - b * avgX;
                 }
@@ -678,7 +740,9 @@ namespace Radzen.Blazor
         {
             IsVisible = !IsVisible;
 
-            if (Chart.LegendClick.HasDelegate)
+            var chart = Chart;
+
+            if (chart?.LegendClick.HasDelegate == true)
             {
                 var args = new LegendClickEventArgs
                 {
@@ -687,18 +751,28 @@ namespace Radzen.Blazor
                     IsVisible = IsVisible,
                 };
 
-                await Chart.LegendClick.InvokeAsync(args);
+                await chart.LegendClick.InvokeAsync(args);
 
                 IsVisible = args.IsVisible;
             }
 
-            await Chart.Refresh();
+            if (chart != null)
+            {
+                await chart.Refresh();
+            }
         }
 
         /// <inheritdoc />
         public string GetTitle()
         {
-            return String.IsNullOrEmpty(Title) ? $"Series {Chart.Series.IndexOf(this) + 1}" : Title;
+            var chart = Chart;
+            if (string.IsNullOrEmpty(Title))
+            {
+                var index = chart?.Series.IndexOf(this) ?? 0;
+                return $"Series {index + 1}";
+            }
+
+            return Title;
         }
 
         /// <summary>
@@ -716,8 +790,9 @@ namespace Radzen.Blazor
         /// <param name="item">The item.</param>
         protected virtual string TooltipTitle(TItem item)
         {
-            var category = Category(Chart.CategoryScale);
-            return Chart.CategoryAxis.Format(Chart.CategoryScale, Chart.CategoryScale.Value(category(item)));
+            var chart = RequireChart();
+            var category = Category(chart.CategoryScale);
+            return chart.CategoryAxis.Format(chart.CategoryScale, chart.CategoryScale.Value(category(item)));
         }
 
         /// <summary>
@@ -727,7 +802,8 @@ namespace Radzen.Blazor
         /// <returns>System.String.</returns>
         protected virtual string TooltipValue(TItem item)
         {
-            return Chart.ValueAxis.Format(Chart.ValueScale, Chart.ValueScale.Value(Value(item)));
+            var chart = RequireChart();
+            return chart.ValueAxis.Format(chart.ValueScale, chart.ValueScale.Value(Value(item)));
         }
 
         /// <summary>
@@ -736,8 +812,9 @@ namespace Radzen.Blazor
         /// <param name="item">The item.</param>
         internal virtual double TooltipX(TItem item)
         {
-            var category = Category(Chart.CategoryScale);
-            return Chart.CategoryScale.Scale(category(item), true);
+            var chart = RequireChart();
+            var category = Category(chart.CategoryScale);
+            return chart.CategoryScale.Scale(category(item), true);
         }
 
         /// <summary>
@@ -746,7 +823,8 @@ namespace Radzen.Blazor
         /// <param name="item">The item.</param>
         internal virtual double TooltipY(TItem item)
         {
-            return Chart.ValueScale.Scale(Value(item), true);
+            var chart = RequireChart();
+            return chart.ValueScale.Scale(Value(item), true);
         }
 
         /// <inheritdoc />
@@ -760,25 +838,26 @@ namespace Radzen.Blazor
                     return new { Item = item, Distance = distance };
                 }).Aggregate((a, b) => a.Distance < b.Distance ? a : b).Item;
 
-                return (retObject,
+                return (retObject!,
                     new Point() { X = TooltipX(retObject), Y = TooltipY(retObject)});
             }
 
-            return (null, null);
+            return (default!, new Point());
         }
 
         /// <inheritdoc />
         public virtual IEnumerable<ChartDataLabel> GetDataLabels(double offsetX, double offsetY)
         {
+            var chart = RequireChart();
             var list = new List<ChartDataLabel>();
 
-            foreach (var d in Data)
+            foreach (var d in Items)
             {
                 list.Add(new ChartDataLabel
                 {
                     Position = new Point { X = TooltipX(d) + offsetX, Y = TooltipY(d) + offsetY },
                     TextAnchor = "middle",
-                    Text = Chart.ValueAxis.Format(Chart.ValueScale, Value(d))
+                    Text = chart.ValueAxis.Format(chart.ValueScale, Value(d))
                 });
             }
 
@@ -793,12 +872,12 @@ namespace Radzen.Blazor
         /// <param name="defaultValue">The default value.</param>
         /// <param name="colorRange">The color range value.</param>
         /// <param name="value">The value of the item.</param>
-        protected string PickColor(int index, IEnumerable<string> colors, string defaultValue = null, IList<SeriesColorRange> colorRange = null, double value = 0.0)
+        protected string? PickColor(int index, IEnumerable<string>? colors, string? defaultValue = null, IList<SeriesColorRange>? colorRange = null, double value = 0.0)
         {
             if (colorRange != null)
             {
                 var result = colorRange.Where(r => r.Min <= value && r.Max >= value).FirstOrDefault<SeriesColorRange>();
-                return result != null ? result.Color : defaultValue;
+                return result?.Color ?? defaultValue;
             }
             else
             {
@@ -819,18 +898,20 @@ namespace Radzen.Blazor
         /// <inheritdoc />
         public async Task InvokeClick(EventCallback<SeriesClickEventArgs> handler, object data)
         {
-            var category = Category(Chart.CategoryScale);
+            var chart = RequireChart();
+            var category = Category(chart.CategoryScale);
+            var dataItem = (TItem)data;
 
             await handler.InvokeAsync(new SeriesClickEventArgs
             {
                 Data = data,
                 Title = GetTitle(),
-                Category = PropertyAccess.GetValue(data, CategoryProperty),
-                Value = PropertyAccess.GetValue(data, ValueProperty),
+                Category = !string.IsNullOrEmpty(CategoryProperty) ? PropertyAccess.GetValue(data, CategoryProperty) : null,
+                Value = !string.IsNullOrEmpty(ValueProperty) ? PropertyAccess.GetValue(data, ValueProperty) : null,
                 Point = new SeriesPoint
                 {
-                    Category = category((TItem)data),
-                    Value = Value((TItem)data)
+                    Category = category(dataItem),
+                    Value = Value(dataItem)
                 }
             });
         }

Radzen.Blazor/ChatMessage.cs

@@ -36,4 +36,8 @@ public class ChatMessage
     /// Gets or sets whether this message is currently streaming.
     /// </summary>
     public bool IsStreaming { get; set; }
+    /// <summary>
+    /// Gets or sets the role associated with the message (e.g., "user", "assistant").
+    /// </summary>
+    public string? Role { get; set; }
 }

Radzen.Blazor/CollectionFilterMode.cs

@@ -0,0 +1,18 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies how the filter should be applied to a collection of items.
+/// </summary>
+public enum CollectionFilterMode
+{
+    /// <summary>
+    /// The filter condition is satisfied if at least one item in the collection matches.
+    /// </summary>
+    Any,
+
+    /// <summary>
+    /// The filter condition is satisfied only if all items in the collection match.
+    /// </summary>
+    All
+}
+

Radzen.Blazor/Colors.cs

@@ -0,0 +1,258 @@
+namespace Radzen;
+
+/// <summary>
+/// Colors.
+/// </summary>
+public static class Colors
+{
+    /// <summary>
+    /// Primary.
+    /// </summary>
+    public const string Primary = "var(--rz-primary)";
+
+    /// <summary>
+    /// Primary lighter.
+    /// </summary>
+    public const string PrimaryLighter = "var(--rz-primary-lighter)";
+
+    /// <summary>
+    /// Primary light.
+    /// </summary>
+    public const string PrimaryLight = "var(--rz-primary-light)";
+
+    /// <summary>
+    /// Primary dark.
+    /// </summary>
+    public const string PrimaryDark = "var(--rz-primary-dark)";
+
+    /// <summary>
+    /// Primary darker.
+    /// </summary>
+    public const string PrimaryDarker = "var(--rz-primary-darker)";
+
+    /// <summary>
+    /// Secondary.
+    /// </summary>
+    public const string Secondary = "var(--rz-secondary)";
+
+    /// <summary>
+    /// Secondary lighter.
+    /// </summary>
+    public const string SecondaryLighter = "var(--rz-secondary-lighter)";
+
+    /// <summary>
+    /// Secondary light.
+    /// </summary>
+    public const string SecondaryLight = "var(--rz-secondary-light)";
+
+    /// <summary>
+    /// Secondary dark.
+    /// </summary>
+    public const string SecondaryDark = "var(--rz-secondary-dark)";
+
+    /// <summary>
+    /// Secondary darker.
+    /// </summary>
+    public const string SecondaryDarker = "var(--rz-secondary-darker)";
+
+    /// <summary>
+    /// Info.
+    /// </summary>
+    public const string Info = "var(--rz-info)";
+
+    /// <summary>
+    /// Info lighter.
+    /// </summary>
+    public const string InfoLighter = "var(--rz-info-lighter)";
+
+    /// <summary>
+    /// Info light.
+    /// </summary>
+    public const string InfoLight = "var(--rz-info-light)";
+
+    /// <summary>
+    /// Info dark.
+    /// </summary>
+    public const string InfoDark = "var(--rz-info-dark)";
+
+    /// <summary>
+    /// Info darker.
+    /// </summary>
+    public const string InfoDarker = "var(--rz-info-darker)";
+
+    /// <summary>
+    /// Success.
+    /// </summary>
+    public const string Success = "var(--rz-success)";
+
+    /// <summary>
+    /// Success lighter.
+    /// </summary>
+    public const string SuccessLighter = "var(--rz-success-lighter)";
+
+    /// <summary>
+    /// Success light.
+    /// </summary>
+    public const string SuccessLight = "var(--rz-success-light)";
+
+    /// <summary>
+    /// Success dark.
+    /// </summary>
+    public const string SuccessDark = "var(--rz-success-dark)";
+
+    /// <summary>
+    /// Success darker.
+    /// </summary>
+    public const string SuccessDarker = "var(--rz-success-darker)";
+
+    /// <summary>
+    /// Warning.
+    /// </summary>
+    public const string Warning = "var(--rz-warning)";
+
+    /// <summary>
+    /// Warning lighter.
+    /// </summary>
+    public const string WarningLighter = "var(--rz-warning-lighter)";
+
+    /// <summary>
+    /// Warning light.
+    /// </summary>
+    public const string WarningLight = "var(--rz-warning-light)";
+
+    /// <summary>
+    /// Warning dark.
+    /// </summary>
+    public const string WarningDark = "var(--rz-warning-dark)";
+
+    /// <summary>
+    /// Warning darker.
+    /// </summary>
+    public const string WarningDarker = "var(--rz-warning-darker)";
+
+    /// <summary>
+    /// Danger.
+    /// </summary>
+    public const string Danger = "var(--rz-danger)";
+
+    /// <summary>
+    /// Danger lighter.
+    /// </summary>
+    public const string DangerLighter = "var(--rz-danger-lighter)";
+
+    /// <summary>
+    /// Danger light.
+    /// </summary>
+    public const string DangerLight = "var(--rz-danger-light)";
+
+    /// <summary>
+    /// Danger dark.
+    /// </summary>
+    public const string DangerDark = "var(--rz-danger-dark)";
+
+    /// <summary>
+    /// Danger darker.
+    /// </summary>
+    public const string DangerDarker = "var(--rz-danger-darker)";
+
+    /// <summary>
+    /// White.
+    /// </summary>
+    public const string White = "var(--rz-white)";
+
+    /// <summary>
+    /// Black.
+    /// </summary>
+    public const string Black = "var(--rz-black)";
+
+    /// <summary>
+    /// Base 50.
+    /// </summary>
+    public const string Base50 = "var(--rz-base-50)";
+
+    /// <summary>
+    /// Base 100.
+    /// </summary>
+    public const string Base100 = "var(--rz-base-100)";
+
+    /// <summary>
+    /// Base 200.
+    /// </summary>
+    public const string Base200 = "var(--rz-base-200)";
+
+    /// <summary>
+    /// Base 300.
+    /// </summary>
+    public const string Base300 = "var(--rz-base-300)";
+
+    /// <summary>
+    /// Base 400.
+    /// </summary>
+    public const string Base400 = "var(--rz-base-400)";
+
+    /// <summary>
+    /// Base 500.
+    /// </summary>
+    public const string Base500 = "var(--rz-base-500)";
+
+    /// <summary>
+    /// Base 600.
+    /// </summary>
+    public const string Base600 = "var(--rz-base-600)";
+
+    /// <summary>
+    /// Base 700.
+    /// </summary>
+    public const string Base700 = "var(--rz-base-700)";
+
+    /// <summary>
+    /// Base 800.
+    /// </summary>
+    public const string Base800 = "var(--rz-base-800)";
+
+    /// <summary>
+    /// Base 900.
+    /// </summary>
+    public const string Base900 = "var(--rz-base-900)";
+
+    /// <summary>
+    /// Series1.
+    /// </summary>
+    public const string Series1 = "var(--rz-series-1)";
+
+    /// <summary>
+    /// Series2.
+    /// </summary>
+    public const string Series2 = "var(--rz-series-2)";
+
+    /// <summary>
+    /// Series3.
+    /// </summary>
+    public const string Series3 = "var(--rz-series-3)";
+
+    /// <summary>
+    /// Series4.
+    /// </summary>
+    public const string Series4 = "var(--rz-series-4)";
+
+    /// <summary>
+    /// Series5.
+    /// </summary>
+    public const string Series5 = "var(--rz-series-5)";
+
+    /// <summary>
+    /// Series6.
+    /// </summary>
+    public const string Series6 = "var(--rz-series-6)";
+
+    /// <summary>
+    /// Series7.
+    /// </summary>
+    public const string Series7 = "var(--rz-series-7)";
+
+    /// <summary>
+    /// Series8.
+    /// </summary>
+    public const string Series8 = "var(--rz-series-8)";
+}
+

Radzen.Blazor/CompositeFilterDescriptor.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+
+namespace Radzen;
+
+/// <summary>
+/// Represents a filter in a component that supports filtering.
+/// </summary>
+public class CompositeFilterDescriptor
+{
+    /// <summary>
+    /// Gets or sets the name of the filtered property.
+    /// </summary>
+    /// <value>The property.</value>
+    public string? Property { get; set; }
+
+    /// <summary>
+    /// Gets or sets the property type.
+    /// </summary>
+    /// <value>The property type.</value>
+    public Type? Type { get; set; }
+
+    /// <summary>
+    /// Gets or sets the name of the filtered property.
+    /// </summary>
+    /// <value>The property.</value>
+    public string? FilterProperty { get; set; }
+
+    /// <summary>
+    /// Gets or sets the value to filter by.
+    /// </summary>
+    /// <value>The filter value.</value>
+    public object? FilterValue { get; set; }
+
+    /// <summary>
+    /// Gets or sets the operator which will compare the property value with <see cref="FilterValue" />.
+    /// </summary>
+    /// <value>The filter operator.</value>
+    public FilterOperator? FilterOperator { get; set; }
+
+    /// <summary>
+    /// Gets or sets the logic used to combine the outcome of filtering by <see cref="FilterValue" />.
+    /// </summary>
+    /// <value>The logical filter operator.</value>
+    public LogicalFilterOperator LogicalFilterOperator { get; set; }
+
+    /// <summary>
+    /// Gets or sets the filters.
+    /// </summary>
+    /// <value>The filters.</value>
+    public IEnumerable<CompositeFilterDescriptor>? Filters { get; set; }
+}
+

Radzen.Blazor/ContextMenuService.cs

@@ -1,225 +1,227 @@
-using Microsoft.AspNetCore.Components;
-using Microsoft.AspNetCore.Components.Web;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-
-namespace Radzen
-{
-    /// <summary>
-    /// Class ContextMenuService. Contains various methods with options to open and close context menus. 
-    /// Should be added as scoped service in the application services and RadzenContextMenu should be added in application main layout.
-    /// Implements the <see cref="IDisposable" />
-    /// </summary>
-    /// <seealso cref="IDisposable" />
-    /// <example>
-    /// <code>
-    /// @inject ContextMenuService ContextMenuService
-    /// &lt;RadzenButton Text="Show context menu" ContextMenu=@(args => ShowContextMenuWithContent(args)) /&gt;
-    /// @code {
-    ///     void ShowContextMenuWithContent(MouseEventArgs args) =&gt; ContextMenuService.Open(args, ds =&gt;
-    ///       @&lt;RadzenMenu Click="OnMenuItemClick"&gt;
-    ///         &lt;RadzenMenuItem Text="Item1" Value="1"&gt;&lt;/RadzenMenuItem&gt;
-    ///         &lt;RadzenMenuItem Text="Item2" Value="2"&gt;&lt;/RadzenMenuItem&gt;
-    ///         &lt;RadzenMenuItem Text="More items" Value="3"&gt;
-    ///             &lt;RadzenMenuItem Text="More sub items" Value="4"&gt;
-    ///                 &lt;RadzenMenuItem Text="Item1" Value="5"&gt;&lt;/RadzenMenuItem&gt;
-    ///                 &lt;RadzenMenuItem Text="Item2" Value="6"&gt;&lt;/RadzenMenuItem&gt;
-    ///             &lt;/RadzenMenuItem&gt;
-    ///         &lt;/RadzenMenuItem&gt;
-    ///       &lt;/RadzenMenu&gt;);
-    /// 
-    ///     void OnMenuItemClick(MenuItemEventArgs args)
-    ///     {
-    ///       Console.WriteLine($"Menu item with Value={args.Value} clicked");
-    ///     }
-    /// }
-    /// </code>
-    /// </example>
-    public class ContextMenuService : IDisposable
-    {
-        /// <summary>
-        /// Gets or sets the navigation manager.
-        /// </summary>
-        /// <value>The navigation manager.</value>
-        NavigationManager navigationManager { get; set; }
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="ContextMenuService"/> class.
-        /// </summary>
-        /// <param name="uriHelper">The URI helper.</param>
-        public ContextMenuService(NavigationManager uriHelper)
-        {
-            navigationManager = uriHelper;
-
-            if (navigationManager != null)
-            {
-                navigationManager.LocationChanged += UriHelper_OnLocationChanged;
-            }
-        }
-
-        /// <summary>
-        /// Handles the OnLocationChanged event of the UriHelper control.
-        /// </summary>
-        /// <param name="sender">The source of the event.</param>
-        /// <param name="e">The <see cref="Microsoft.AspNetCore.Components.Routing.LocationChangedEventArgs"/> instance containing the event data.</param>
-        private void UriHelper_OnLocationChanged(object sender, Microsoft.AspNetCore.Components.Routing.LocationChangedEventArgs e)
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.Web;
+using System;
+using System.Collections.Generic;
+
+namespace Radzen
+{
+    /// <summary>
+    /// Class ContextMenuService. Contains various methods with options to open and close context menus. 
+    /// Should be added as scoped service in the application services and RadzenContextMenu should be added in application main layout.
+    /// Implements the <see cref="IDisposable" />
+    /// </summary>
+    /// <seealso cref="IDisposable" />
+    /// <example>
+    /// <code>
+    /// @inject ContextMenuService ContextMenuService
+    /// &lt;RadzenButton Text="Show context menu" ContextMenu=@(args => ShowContextMenuWithContent(args)) /&gt;
+    /// @code {
+    ///     void ShowContextMenuWithContent(MouseEventArgs args) =&gt; ContextMenuService.Open(args, ds =&gt;
+    ///       @&lt;RadzenMenu Click="OnMenuItemClick"&gt;
+    ///         &lt;RadzenMenuItem Text="Item1" Value="1"&gt;&lt;/RadzenMenuItem&gt;
+    ///         &lt;RadzenMenuItem Text="Item2" Value="2"&gt;&lt;/RadzenMenuItem&gt;
+    ///         &lt;RadzenMenuItem Text="More items" Value="3"&gt;
+    ///             &lt;RadzenMenuItem Text="More sub items" Value="4"&gt;
+    ///                 &lt;RadzenMenuItem Text="Item1" Value="5"&gt;&lt;/RadzenMenuItem&gt;
+    ///                 &lt;RadzenMenuItem Text="Item2" Value="6"&gt;&lt;/RadzenMenuItem&gt;
+    ///             &lt;/RadzenMenuItem&gt;
+    ///         &lt;/RadzenMenuItem&gt;
+    ///       &lt;/RadzenMenu&gt;);
+    /// 
+    ///     void OnMenuItemClick(MenuItemEventArgs args)
+    ///     {
+    ///       Console.WriteLine($"Menu item with Value={args.Value} clicked");
+    ///     }
+    /// }
+    /// </code>
+    /// </example>
+    public class ContextMenuService : IDisposable
+    {
+        /// <summary>
+        /// Gets or sets the navigation manager.
+        /// </summary>
+        /// <value>The navigation manager.</value>
+        NavigationManager? navigationManager { get; set; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ContextMenuService"/> class.
+        /// </summary>
+        /// <param name="uriHelper">The URI helper.</param>
+        public ContextMenuService(NavigationManager? uriHelper)
         {
-            this.OnNavigate?.Invoke();
-        }
-
-        /// <summary>
-        /// Occurs when [on navigate].
-        /// </summary>
-        public event Action OnNavigate;
-
-        /// <summary>
-        /// Raises the Close event.
-        /// </summary>
-        public event Action OnClose;
-
-        /// <summary>
-        /// Occurs when [on open].
-        /// </summary>
-        public event Action<MouseEventArgs, ContextMenuOptions> OnOpen;
-
-        /// <summary>
-        /// Opens the specified arguments.
-        /// </summary>
-        /// <param name="args">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
-        /// <param name="items">The items.</param>
-        /// <param name="click">The click.</param>
-        public void Open(MouseEventArgs args, IEnumerable<ContextMenuItem> items, Action<MenuItemEventArgs> click = null)
-        {
-            var options = new ContextMenuOptions();
-
-            options.Items = items;
-            options.Click = click;
-
-            OpenTooltip(args, options);
-        }
-
-        /// <summary>
-        /// Opens the specified arguments.
-        /// </summary>
-        /// <param name="args">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
-        /// <param name="childContent">Content of the child.</param>
-        public void Open(MouseEventArgs args, RenderFragment<ContextMenuService> childContent)
-        {
-            var options = new ContextMenuOptions();
-
-            options.ChildContent = childContent;
-
-            OpenTooltip(args, options);
-        }
-
-        /// <summary>
-        /// Opens the tooltip.
-        /// </summary>
-        /// <param name="args">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
-        /// <param name="options">The options.</param>
-        private void OpenTooltip(MouseEventArgs args, ContextMenuOptions options)
-        {
-            OnOpen?.Invoke(args, options);
-        }
-
-        /// <summary>
-        /// Closes this instance.
-        /// </summary>
-        public void Close()
-        {
-            OnClose?.Invoke();
-        }
-
-        /// <summary>
-        /// Disposes this instance.
-        /// </summary>
-        public void Dispose()
-        {
-            navigationManager.LocationChanged -= UriHelper_OnLocationChanged;
-        }
-    }
-
-    /// <summary>
-    /// Class ContextMenuOptions.
-    /// </summary>
-    public class ContextMenuOptions
-    {
-        /// <summary>
-        /// Gets or sets the child content.
-        /// </summary>
-        /// <value>The child content.</value>
-        public RenderFragment<ContextMenuService> ChildContent { get; set; }
-        /// <summary>
-        /// Gets or sets the items.
-        /// </summary>
-        /// <value>The items.</value>
-        public IEnumerable<ContextMenuItem> Items { get; set; }
-
-        /// <summary>
-        /// Gets or sets the click.
-        /// </summary>
-        /// <value>The click.</value>
-        public Action<MenuItemEventArgs> Click { get; set; }
-    }
-
-    /// <summary>
-    /// Class ContextMenu.
-    /// </summary>
-    public class ContextMenu
-    {
-        /// <summary>
-        /// Gets or sets the options.
-        /// </summary>
-        /// <value>The options.</value>
-        public ContextMenuOptions Options { get; set; }
-        /// <summary>
-        /// Gets or sets the mouse event arguments.
-        /// </summary>
-        /// <value>The mouse event arguments.</value>
-        public MouseEventArgs MouseEventArgs { get; set; }
-    }
-
-    /// <summary>
-    /// Class ContextMenuItem.
-    /// </summary>
-    public class ContextMenuItem
-    {
-        /// <summary>
-        /// Gets or sets the text.
-        /// </summary>
-        /// <value>The text.</value>
-        public string Text { get; set; }
-        /// <summary>
-        /// Gets or sets the value.
-        /// </summary>
-        /// <value>The value.</value>
-        public object Value { get; set; }
-        /// <summary>
-        /// Gets or sets the icon.
-        /// </summary>
-        /// <value>The icon.</value>
-        public string Icon { get; set; }
-        /// <summary>
-        /// Gets or sets the icon color.
-        /// </summary>
-        /// <value>The icon color.</value>
-        public string IconColor { get; set; }
-        /// <summary>
-        /// Gets or sets the image.
-        /// </summary>
-        /// <value>The image.</value>
-        public string Image { get; set; }
-        /// <summary>
-        /// Gets or sets the image style.
-        /// </summary>
-        /// <value>The image style.</value>
-        public string ImageStyle { get; set; }
-        /// <summary>
-        /// Gets a value indicating whether this instance is disabled.
-        /// </summary>
-        /// <value><c>true</c> if this instance is disabled; otherwise, <c>false</c>.</value>
-        public bool Disabled { get; set; }
-    }
-}
+            navigationManager = uriHelper;
+
+            if (navigationManager != null)
+            {
+                navigationManager.LocationChanged += UriHelper_OnLocationChanged;
+            }
+        }
+
+        /// <summary>
+        /// Handles the OnLocationChanged event of the UriHelper control.
+        /// </summary>
+        /// <param name="sender">The source of the event.</param>
+        /// <param name="e">The <see cref="Microsoft.AspNetCore.Components.Routing.LocationChangedEventArgs"/> instance containing the event data.</param>
+        private void UriHelper_OnLocationChanged(object? sender, Microsoft.AspNetCore.Components.Routing.LocationChangedEventArgs e)
+        {
+            this.OnNavigate?.Invoke();
+        }
+
+        /// <summary>
+        /// Occurs when [on navigate].
+        /// </summary>
+        public event Action? OnNavigate;
+
+        /// <summary>
+        /// Raises the Close event.
+        /// </summary>
+        public event Action? OnClose;
+
+        /// <summary>
+        /// Occurs when [on open].
+        /// </summary>
+        public event Action<MouseEventArgs, ContextMenuOptions>? OnOpen;
+
+        /// <summary>
+        /// Opens the specified arguments.
+        /// </summary>
+        /// <param name="args">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
+        /// <param name="items">The items.</param>
+        /// <param name="click">The click.</param>
+        public void Open(MouseEventArgs args, IEnumerable<ContextMenuItem> items, Action<MenuItemEventArgs>? click = null)
+        {
+            var options = new ContextMenuOptions();
+
+            options.Items = items;
+            options.Click = click;
+
+            OpenTooltip(args, options);
+        }
+
+        /// <summary>
+        /// Opens the specified arguments.
+        /// </summary>
+        /// <param name="args">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
+        /// <param name="childContent">Content of the child.</param>
+        public void Open(MouseEventArgs args, RenderFragment<ContextMenuService> childContent)
+        {
+            var options = new ContextMenuOptions();
+
+            options.ChildContent = childContent;
+
+            OpenTooltip(args, options);
+        }
+
+        /// <summary>
+        /// Opens the tooltip.
+        /// </summary>
+        /// <param name="args">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
+        /// <param name="options">The options.</param>
+        private void OpenTooltip(MouseEventArgs args, ContextMenuOptions options)
+        {
+            OnOpen?.Invoke(args, options);
+        }
+
+        /// <summary>
+        /// Closes this instance.
+        /// </summary>
+        public void Close()
+        {
+            OnClose?.Invoke();
+        }
+
+        /// <summary>
+        /// Disposes this instance.
+        /// </summary>
+        public void Dispose()
+        {
+            if (navigationManager != null)
+            {
+                navigationManager.LocationChanged -= UriHelper_OnLocationChanged;
+            }
+            GC.SuppressFinalize(this);
+        }
+    }
+
+    /// <summary>
+    /// Class ContextMenuOptions.
+    /// </summary>
+    public class ContextMenuOptions
+    {
+        /// <summary>
+        /// Gets or sets the child content.
+        /// </summary>
+        /// <value>The child content.</value>
+        public RenderFragment<ContextMenuService>? ChildContent { get; set; }
+        /// <summary>
+        /// Gets or sets the items.
+        /// </summary>
+        /// <value>The items.</value>
+        public IEnumerable<ContextMenuItem>? Items { get; set; }
+
+        /// <summary>
+        /// Gets or sets the click.
+        /// </summary>
+        /// <value>The click.</value>
+        public Action<MenuItemEventArgs>? Click { get; set; }
+    }
+
+    /// <summary>
+    /// Class ContextMenu.
+    /// </summary>
+    public class ContextMenu
+    {
+        /// <summary>
+        /// Gets or sets the options.
+        /// </summary>
+        /// <value>The options.</value>
+        public ContextMenuOptions? Options { get; set; }
+        /// <summary>
+        /// Gets or sets the mouse event arguments.
+        /// </summary>
+        /// <value>The mouse event arguments.</value>
+        public MouseEventArgs? MouseEventArgs { get; set; }
+    }
+
+    /// <summary>
+    /// Class ContextMenuItem.
+    /// </summary>
+    public class ContextMenuItem
+    {
+        /// <summary>
+        /// Gets or sets the text.
+        /// </summary>
+        /// <value>The text.</value>
+        public string? Text { get; set; }
+        /// <summary>
+        /// Gets or sets the value.
+        /// </summary>
+        /// <value>The value.</value>
+        public object? Value { get; set; }
+        /// <summary>
+        /// Gets or sets the icon.
+        /// </summary>
+        /// <value>The icon.</value>
+        public string? Icon { get; set; }
+        /// <summary>
+        /// Gets or sets the icon color.
+        /// </summary>
+        /// <value>The icon color.</value>
+        public string? IconColor { get; set; }
+        /// <summary>
+        /// Gets or sets the image.
+        /// </summary>
+        /// <value>The image.</value>
+        public string? Image { get; set; }
+        /// <summary>
+        /// Gets or sets the image style.
+        /// </summary>
+        /// <value>The image style.</value>
+        public string? ImageStyle { get; set; }
+        /// <summary>
+        /// Gets a value indicating whether this instance is disabled.
+        /// </summary>
+        /// <value><c>true</c> if this instance is disabled; otherwise, <c>false</c>.</value>
+        public bool Disabled { get; set; }
+    }
+}

Radzen.Blazor/ConversationSession.cs

@@ -0,0 +1,92 @@
+using System;
+using System.Collections.Generic;
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Represents a conversation session with memory.
+/// </summary>
+public class ConversationSession
+{
+    /// <summary>
+    /// Gets or sets the unique identifier for the conversation session.
+    /// </summary>
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+
+    /// <summary>
+    /// Gets or sets the list of messages in the conversation.
+    /// </summary>
+    public List<ChatMessage> Messages { get; set; } = new();
+
+    /// <summary>
+    /// Gets or sets the timestamp when the conversation was created.
+    /// </summary>
+    public DateTime CreatedAt { get; set; } = DateTime.Now;
+
+    /// <summary>
+    /// Gets or sets the timestamp when the conversation was last updated.
+    /// </summary>
+    public DateTime LastUpdated { get; set; } = DateTime.Now;
+
+    /// <summary>
+    /// Gets or sets the maximum number of messages to keep in memory.
+    /// </summary>
+    public int MaxMessages { get; set; } = 50;
+
+    /// <summary>
+    /// Adds a message to the conversation and manages memory limits.
+    /// </summary>
+    /// <param name="role">The role of the message sender.</param>
+    /// <param name="content">The message content.</param>
+    public void AddMessage(string role, string content)
+    {
+        Messages.Add(new ChatMessage
+        {
+            UserId = role,
+            Role = role,
+            IsUser = role == "user",
+            Content = content,
+            Timestamp = DateTime.Now
+        });
+
+        LastUpdated = DateTime.Now;
+
+        // Remove oldest messages if we exceed the limit
+        while (Messages.Count > MaxMessages)
+        {
+            Messages.RemoveAt(0);
+        }
+    }
+
+    /// <summary>
+    /// Clears all messages from the conversation.
+    /// </summary>
+    public void Clear()
+    {
+        Messages.Clear();
+        LastUpdated = DateTime.Now;
+    }
+
+    /// <summary>
+    /// Gets the conversation messages formatted for the AI API.
+    /// </summary>
+    /// <param name="systemPrompt">The system prompt to include.</param>
+    /// <returns>A list of message objects for the AI API.</returns>
+    public List<object> GetFormattedMessages(string systemPrompt)
+    {
+        var messages = new List<object>();
+
+        // Add system message
+        messages.Add(new { role = "system", content = systemPrompt });
+
+        // Add conversation messages
+        foreach (var message in Messages)
+        {
+            messages.Add(new { role = message.Role, content = message.Content });
+        }
+
+        return messages;
+    }
+}
+

Radzen.Blazor/ConvertType.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+
+namespace Radzen;
+
+/// <summary>
+/// Converts values to different types. Used internally.
+/// </summary>
+public static class ConvertType
+{
+    /// <summary>
+    /// Changes the type of an object.
+    /// </summary>
+    /// <param name="value">The value.</param>
+    /// <param name="type">The type.</param>
+    /// <param name="culture">The culture.</param>
+    /// <returns>System.Object</returns>
+    public static object? ChangeType(object value, Type type, CultureInfo? culture = null)
+    {
+        ArgumentNullException.ThrowIfNull(type);
+
+        // CA1062: Validate 'value' is non-null before using it
+        if (value == null)
+        {
+            if (Nullable.GetUnderlyingType(type) != null)
+            {
+                return null;
+            }
+            throw new ArgumentNullException(nameof(value));
+        }
+
+        if (culture == null)
+        {
+            culture = CultureInfo.CurrentCulture;
+        }
+
+        if ((Nullable.GetUnderlyingType(type) ?? type) == typeof(Guid) && value is string)
+        {
+            return Guid.Parse((string)value);
+        }
+
+        var underlyingEnumType = Nullable.GetUnderlyingType(type);
+        if (underlyingEnumType?.IsEnum == true)
+        {
+            var valueString = value.ToString();
+            if (valueString == null)
+            {
+                throw new ArgumentNullException(nameof(value), "Enum value cannot be null.");
+            }
+            return Enum.Parse(underlyingEnumType, valueString);
+        }
+
+        if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(IEnumerable<>))
+        {
+            Type itemType = type.GetGenericArguments()[0];
+            var enumerable = value as IEnumerable<object>;
+
+            if (enumerable != null)
+            {
+                return enumerable.AsQueryable().Cast(itemType);
+            }
+        }
+
+        return value is IConvertible ? Convert.ChangeType(value, Nullable.GetUnderlyingType(type) ?? type, culture) : value;
+    }
+}
+

Radzen.Blazor/CookieThemeService.cs

@@ -44,18 +44,18 @@ namespace Radzen
         /// <summary>
         /// Gets or sets a value indicating whether to use secure cookies.
         /// </summary>
-        public bool IsSecure { get; set; } = false;
+        public bool IsSecure { get; set; }
 
         /// <summary>
         /// Gets or sets the SameSite attribute for the cookie.
         /// </summary>
-        public CookieSameSiteMode? SameSite { get; set; } = null;
+        public CookieSameSiteMode? SameSite { get; set; }
     }
 
     /// <summary>
     /// Persist the current theme in a cookie. Requires <see cref="ThemeService" /> to be registered in the DI container.
     /// </summary>
-    public class CookieThemeService
+    public class CookieThemeService : IDisposable
     {
         private readonly CookieThemeServiceOptions options;
         private readonly IJSRuntime jsRuntime;
@@ -64,13 +64,16 @@ namespace Radzen
         /// <summary>
         /// Initializes a new instance of the <see cref="CookieThemeService" /> class.
         /// </summary>
-        public CookieThemeService(IJSRuntime jsRuntime, ThemeService themeService, IOptions<CookieThemeServiceOptions> options)
+        public CookieThemeService(IJSRuntime jsRuntime, ThemeService themeService, IOptions<CookieThemeServiceOptions>? options)
         {
             this.jsRuntime = jsRuntime;
             this.themeService = themeService;
-            this.options = options.Value;
+            this.options = options?.Value ?? new CookieThemeServiceOptions();
 
-            themeService.ThemeChanged += OnThemeChanged;
+            if (themeService != null)
+            {
+                themeService.ThemeChanged += OnThemeChanged;
+            }
 
             _ = InitializeAsync();
         }
@@ -118,6 +121,13 @@ namespace Radzen
 
             _ = jsRuntime.InvokeVoidAsync("eval", $"document.cookie = \"{cookie}\"");
         }
+
+        /// <inheritdoc />
+        public void Dispose()
+        {
+            themeService.ThemeChanged -= OnThemeChanged;
+            GC.SuppressFinalize(this);
+        }
     }
 
     /// <summary>

Radzen.Blazor/CoordinateSystem.cs

@@ -0,0 +1,18 @@
+namespace Radzen;
+
+/// <summary>
+/// CoordinateSystem enum
+/// </summary>
+public enum CoordinateSystem
+{
+    /// <summary>
+    /// Cartesian CoordinateSystem
+    /// </summary>
+    Cartesian,
+
+    /// <summary>
+    /// Polar CoordinateSystem
+    /// </summary>
+    Polar
+}
+

Radzen.Blazor/DataBoundFormComponent.cs

@@ -47,14 +47,14 @@ namespace Radzen
         /// </summary>
         /// <value>The name.</value>
         [Parameter]
-        public string Name { get; set; }
+        public string? Name { get; set; }
 
         /// <summary>
         /// Gets or sets the placeholder.
         /// </summary>
         /// <value>The placeholder.</value>
         [Parameter]
-        public string Placeholder { get; set; }
+        public string? Placeholder { get; set; }
 
         /// <summary>
         /// Gets or sets a value indicating whether this <see cref="DataBoundFormComponent{T}"/> is disabled.
@@ -80,36 +80,36 @@ namespace Radzen
         /// <summary>
         /// The form
         /// </summary>
-        IRadzenForm _form;
+        IRadzenForm? form;
 
         /// <summary>
         /// Gets or sets the form.
         /// </summary>
         /// <value>The form.</value>
         [CascadingParameter]
-        public IRadzenForm Form
+        public IRadzenForm? Form
         {
             get
             {
-                return _form;
+                return form;
             }
             set
             {
-                _form = value;
-                _form?.AddComponent(this);
+                form = value;
+                form?.AddComponent(this);
             }
         }
 
         /// <summary>
         /// The value
         /// </summary>
-        private T _value = default;
+        private T? _value;
         /// <summary>
         /// Gets or sets the value.
         /// </summary>
         /// <value>The value.</value>
         [Parameter]
-        public T Value
+        public T? Value
         {
             get
             {
@@ -167,18 +167,18 @@ namespace Radzen
         /// </summary>
         /// <value>The text property.</value>
         [Parameter]
-        public string TextProperty { get; set; }
+        public string? TextProperty { get; set; }
 
         /// <summary>
         /// The data
         /// </summary>
-        IEnumerable _data = null;
+        IEnumerable? _data;
         /// <summary>
         /// Gets or sets the data.
         /// </summary>
         /// <value>The data.</value>
         [Parameter]
-        public virtual IEnumerable Data
+        public virtual IEnumerable? Data
         {
             get
             {
@@ -208,7 +208,7 @@ namespace Radzen
         /// Gets the query.
         /// </summary>
         /// <value>The query.</value>
-        protected virtual IQueryable Query
+        protected virtual IQueryable? Query
         {
             get
             {
@@ -220,7 +220,7 @@ namespace Radzen
         /// Gets or sets the search text
         /// </summary>
         [Parameter]
-        public string SearchText
+        public string? SearchText
         {
             get
             {
@@ -245,29 +245,30 @@ namespace Radzen
         /// <summary>
         /// The search text
         /// </summary>
-        internal string searchText;
+        internal string? searchText;
 
         /// <summary>
         /// The view
         /// </summary>
-        protected IQueryable _view = null;
+        protected IQueryable? _view;
         /// <summary>
         /// Gets the view.
         /// </summary>
         /// <value>The view.</value>
-        protected virtual IEnumerable View
+        protected virtual IEnumerable? View
         {
             get
             {
-                if (_view == null && Query != null)
+                var query = Query;
+                if (_view == null && query != null)
                 {
-                    if (!string.IsNullOrEmpty(searchText))
+                    if (!string.IsNullOrEmpty(searchText) && !string.IsNullOrEmpty(TextProperty))
                     {
-                        _view = Query.Where(TextProperty, searchText, FilterOperator, FilterCaseSensitivity);
+                        _view = query.Where(TextProperty, searchText, FilterOperator, FilterCaseSensitivity);
                     }
                     else
                     {
-                        _view = (typeof(IQueryable).IsAssignableFrom(Data.GetType())) ? Query.Cast<object>().ToList().AsQueryable() : Query;
+                        _view = Data is IQueryable ? query.Cast<object>().ToList().AsQueryable() : query;
                     }
                 }
 
@@ -275,14 +276,14 @@ namespace Radzen
             }
         }
 
-        internal IEnumerable GetView() => View;
+        internal IEnumerable? GetView() => View;
 
         /// <summary>
         /// Gets or sets the edit context.
         /// </summary>
         /// <value>The edit context.</value>
         [CascadingParameter]
-        public EditContext EditContext { get; set; }
+        public EditContext? EditContext { get; set; }
 
         /// <summary>
         /// Gets the field identifier.
@@ -296,7 +297,7 @@ namespace Radzen
         /// </summary>
         /// <value>The value expression.</value>
         [Parameter]
-        public Expression<Func<T>> ValueExpression { get; set; }
+        public Expression<Func<T>>? ValueExpression { get; set; }
         /// <summary>
         /// Set parameters as an asynchronous operation.
         /// </summary>
@@ -338,7 +339,7 @@ namespace Radzen
         /// </summary>
         /// <param name="sender">The sender.</param>
         /// <param name="e">The <see cref="ValidationStateChangedEventArgs"/> instance containing the event data.</param>
-        private void ValidationStateChanged(object sender, ValidationStateChangedEventArgs e)
+        private void ValidationStateChanged(object? sender, ValidationStateChangedEventArgs e)
         {
             StateHasChanged();
         }
@@ -356,13 +357,15 @@ namespace Radzen
             }
 
             Form?.RemoveComponent(this);
+
+            GC.SuppressFinalize(this);
         }
 
         /// <summary>
         /// Gets the value.
         /// </summary>
         /// <returns>System.Object.</returns>
-        public virtual object GetValue()
+        public virtual object? GetValue()
         {
             return Value;
         }
@@ -386,13 +389,13 @@ namespace Radzen
 
         /// <summary> Provides support for RadzenFormField integration. </summary>
         [CascadingParameter]
-        public IFormFieldContext FormFieldContext { get; set; }
+        public IFormFieldContext? FormFieldContext { get; set; }
 
         /// <summary> Gets the current placeholder. Returns empty string if this component is inside a RadzenFormField.</summary>
-        protected string CurrentPlaceholder => FormFieldContext?.AllowFloatingLabel == true ? " " : Placeholder;
+        protected string? CurrentPlaceholder => FormFieldContext?.AllowFloatingLabel == true ? " " : Placeholder;
 
         /// <summary>
-        /// Handles the <see cref="E:ContextMenu" /> event.
+        /// Handles the ContextMenu event.
         /// </summary>
         /// <param name="args">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
         /// <returns>Task.</returns>

Radzen.Blazor/DataGridCellMouseEventArgs.cs

@@ -0,0 +1,21 @@
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="RadzenDataGrid{TItem}.CellContextMenu" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridCellMouseEventArgs<T> : Microsoft.AspNetCore.Components.Web.MouseEventArgs where T : notnull
+{
+    /// <summary>
+    /// Gets the data item which the clicked DataGrid row represents.
+    /// </summary>
+    public T? Data { get; internal set; }
+
+    /// <summary>
+    /// Gets the RadzenDataGridColumn which this cells represents.
+    /// </summary>
+    public RadzenDataGridColumn<T>? Column { get; internal set; }
+}
+

Radzen.Blazor/DataGridCellRenderEventArgs.cs

@@ -0,0 +1,16 @@
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="RadzenDataGrid{TItem}.CellRender" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridCellRenderEventArgs<T> : RowRenderEventArgs<T> where T : notnull
+{
+    /// <summary>
+    /// Gets the RadzenDataGridColumn which this cells represents.
+    /// </summary>
+    public RadzenDataGridColumn<T>? Column { get; internal set; }
+}
+

Radzen.Blazor/DataGridChildData.cs

@@ -0,0 +1,26 @@
+using System.Collections.Generic;
+
+namespace Radzen;
+
+/// <summary>
+/// Internal class for managing hierarchical child data in DataGrid.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+internal class DataGridChildData<T>
+{
+    /// <summary>
+    /// Gets or sets the parent child data.
+    /// </summary>
+    internal DataGridChildData<T>? ParentChildData { get; set; }
+
+    /// <summary>
+    /// Gets or sets the level.
+    /// </summary>
+    internal int Level { get; set; }
+
+    /// <summary>
+    /// Gets or sets the data.
+    /// </summary>
+    internal IEnumerable<T>? Data { get; set; }
+}
+

Radzen.Blazor/DataGridColumnFilterEventArgs.cs

@@ -0,0 +1,41 @@
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="RadzenDataGrid{TItem}.Filter" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridColumnFilterEventArgs<T> where T : notnull
+{
+    /// <summary>
+    /// Gets the filtered RadzenDataGridColumn.
+    /// </summary>
+    public RadzenDataGridColumn<T>? Column { get; internal set; }
+
+    /// <summary>
+    /// Gets the new filter value of the filtered column.
+    /// </summary>
+    public object? FilterValue { get; internal set; }
+
+    /// <summary>
+    /// Gets the new second filter value of the filtered column.
+    /// </summary>
+    public object? SecondFilterValue { get; internal set; }
+
+    /// <summary>
+    /// Gets the new filter operator of the filtered column.
+    /// </summary>
+    public FilterOperator FilterOperator { get; internal set; }
+
+    /// <summary>
+    /// Gets the new second filter operator of the filtered column.
+    /// </summary>
+    public FilterOperator SecondFilterOperator { get; internal set; }
+
+    /// <summary>
+    /// Gets the new logical filter operator of the filtered column.
+    /// </summary>
+    public LogicalFilterOperator LogicalFilterOperator { get; internal set; }
+}
+

Radzen.Blazor/DataGridColumnGroupEventArgs.cs

@@ -0,0 +1,21 @@
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="RadzenDataGrid{TItem}.Group" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridColumnGroupEventArgs<T> where T : notnull
+{
+    /// <summary>
+    /// Gets the grouped RadzenDataGridColumn.
+    /// </summary>
+    public RadzenDataGridColumn<T>? Column { get; internal set; }
+
+    /// <summary>
+    /// Gets the group descriptor.
+    /// </summary>
+    public GroupDescriptor? GroupDescriptor { get; internal set; }
+}
+

Radzen.Blazor/DataGridColumnReorderedEventArgs.cs

@@ -0,0 +1,26 @@
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="RadzenDataGrid{TItem}.ColumnReordered" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridColumnReorderedEventArgs<T> where T : notnull
+{
+    /// <summary>
+    /// Gets the reordered RadzenDataGridColumn.
+    /// </summary>
+    public RadzenDataGridColumn<T>? Column { get; internal set; }
+
+    /// <summary>
+    /// Gets the old index of the column.
+    /// </summary>
+    public int OldIndex { get; internal set; }
+
+    /// <summary>
+    /// Gets the new index of the column.
+    /// </summary>
+    public int NewIndex { get; internal set; }
+}
+

Radzen.Blazor/DataGridColumnReorderingEventArgs.cs

@@ -0,0 +1,27 @@
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="RadzenDataGrid{TItem}.ColumnReordering" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridColumnReorderingEventArgs<T> where T : notnull
+{
+    /// <summary>
+    /// Gets the reordered RadzenDataGridColumn.
+    /// </summary>
+    public RadzenDataGridColumn<T>? Column { get; internal set; }
+
+    /// <summary>
+    /// Gets the reordered to RadzenDataGridColumn.
+    /// </summary>
+    public RadzenDataGridColumn<T>? ToColumn { get; internal set; }
+
+    /// <summary>
+    /// Gets or sets a value which will cancel the event.
+    /// </summary>
+    /// <value><c>true</c> to cancel the event; otherwise, <c>false</c>.</value>
+    public bool Cancel { get; set; }
+}
+

Radzen.Blazor/DataGridColumnResizedEventArgs.cs

@@ -0,0 +1,21 @@
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="RadzenDataGrid{TItem}.ColumnResized" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridColumnResizedEventArgs<T> where T : notnull
+{
+    /// <summary>
+    /// Gets the resized RadzenDataGridColumn.
+    /// </summary>
+    public RadzenDataGridColumn<T>? Column { get; internal set; }
+
+    /// <summary>
+    /// Gets the new width of the resized column.
+    /// </summary>
+    public double Width { get; internal set; }
+}
+

Radzen.Blazor/DataGridColumnSettings.cs

@@ -0,0 +1,81 @@
+namespace Radzen;
+
+/// <summary>
+/// DataGrid column settings class used to Save/Load settings.
+/// </summary>
+public class DataGridColumnSettings
+{
+    /// <summary>
+    /// Property.
+    /// </summary>
+    public string UniqueID { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Property.
+    /// </summary>
+    public string Property { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Visible.
+    /// </summary>
+    public bool Visible { get; set; }
+
+    /// <summary>
+    /// Width.
+    /// </summary>
+    public string Width { get; set; } = string.Empty;
+
+    /// <summary>
+    /// OrderIndex.
+    /// </summary>
+    public int? OrderIndex { get; set; }
+
+    /// <summary>
+    /// SortOrder.
+    /// </summary>
+    public SortOrder? SortOrder { get; set; }
+
+    /// <summary>
+    /// SortIndex.
+    /// </summary>
+    public int? SortIndex { get; set; }
+
+    /// <summary>
+    /// FilterValue.
+    /// </summary>
+    public object? FilterValue { get; set; }
+
+    /// <summary>
+    /// FilterOperator.
+    /// </summary>
+    public FilterOperator FilterOperator { get; set; }
+
+    /// <summary>
+    /// SecondFilterValue.
+    /// </summary>
+    public object? SecondFilterValue { get; set; }
+
+    /// <summary>
+    /// SecondFilterOperator.
+    /// </summary>
+    public FilterOperator SecondFilterOperator { get; set; }
+
+    /// <summary>
+    /// LogicalFilterOperator.
+    /// </summary>
+    public LogicalFilterOperator LogicalFilterOperator { get; set; }
+
+    /// <summary>
+    /// CustomFilterExpression.
+    /// </summary>
+    public string CustomFilterExpression { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the mode that determines whether the filter applies to any or all items in a collection.
+    /// </summary>
+    /// <value>
+    /// A <see cref="CollectionFilterMode"/> value indicating whether the filter is satisfied by any or all items.
+    /// </value>
+    public CollectionFilterMode CollectionFilterMode { get; set; }
+}
+

Radzen.Blazor/DataGridColumnSortEventArgs.cs

@@ -0,0 +1,21 @@
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="RadzenDataGrid{TItem}.Sort" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridColumnSortEventArgs<T> where T : notnull
+{
+    /// <summary>
+    /// Gets the sorted RadzenDataGridColumn.
+    /// </summary>
+    public RadzenDataGridColumn<T>? Column { get; internal set; }
+
+    /// <summary>
+    /// Gets the new sort order of the sorted column.
+    /// </summary>
+    public SortOrder? SortOrder { get; internal set; }
+}
+

Radzen.Blazor/DataGridEditMode.cs

@@ -0,0 +1,18 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the inline edit mode behavior of <see cref="Radzen.Blazor.RadzenDataGrid{TItem}" />.
+/// </summary>
+public enum DataGridEditMode
+{
+    /// <summary>
+    /// The user can edit only one row at a time. Editing a different row cancels edit mode for the last edited row.
+    /// </summary>
+    Single,
+
+    /// <summary>
+    /// The user can edit multiple rows.
+    /// </summary>
+    Multiple
+}
+

Radzen.Blazor/DataGridExpandMode.cs

@@ -0,0 +1,18 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the expand behavior of <see cref="Radzen.Blazor.RadzenDataGrid{TItem}" />.
+/// </summary>
+public enum DataGridExpandMode
+{
+    /// <summary>
+    /// The user can expand only one row at a time. Expanding a different row collapses the last expanded row.
+    /// </summary>
+    Single,
+
+    /// <summary>
+    /// The user can expand multiple rows.
+    /// </summary>
+    Multiple
+}
+

Radzen.Blazor/DataGridGridLines.cs

@@ -0,0 +1,33 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the grid lines of <see cref="Radzen.Blazor.RadzenDataGrid{TItem}" />.
+/// </summary>
+public enum DataGridGridLines
+{
+    /// <summary>
+    /// Theme default.
+    /// </summary>
+    Default,
+
+    /// <summary>
+    /// Both horizontal and vertical grid lines.
+    /// </summary>
+    Both,
+
+    /// <summary>
+    /// No grid lines.
+    /// </summary>
+    None,
+
+    /// <summary>
+    /// Horizontal grid lines.
+    /// </summary>
+    Horizontal,
+
+    /// <summary>
+    /// Vertical grid lines.
+    /// </summary>
+    Vertical
+}
+

Radzen.Blazor/DataGridLoadChildDataEventArgs.cs

@@ -0,0 +1,23 @@
+using System.Collections.Generic;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="Radzen.Blazor.RadzenDataGrid{TItem}.LoadChildData" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridLoadChildDataEventArgs<T>
+{
+    /// <summary>
+    /// Gets or sets the data.
+    /// </summary>
+    /// <value>The data.</value>
+    public IEnumerable<T>? Data { get; set; }
+
+    /// <summary>
+    /// Gets the item.
+    /// </summary>
+    /// <value>The item.</value>
+    public T? Item { get; internal set; }
+}
+

Radzen.Blazor/DataGridLoadColumnFilterDataEventArgs.cs

@@ -0,0 +1,53 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="Radzen.Blazor.RadzenDataGrid{TItem}.LoadColumnFilterData" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridLoadColumnFilterDataEventArgs<T> where T : notnull
+{
+    /// <summary>
+    /// Gets or sets the data.
+    /// </summary>
+    /// <value>The data.</value>
+    public IEnumerable? Data { get; set; }
+
+    /// <summary>
+    /// Gets or sets the total data count.
+    /// </summary>
+    /// <value>The total data count.</value>
+    public int Count { get; set; }
+
+    /// <summary>
+    /// Gets how many items to skip. Related to paging and the current page. Usually used with the <see cref="Enumerable.Skip{TSource}(IEnumerable{TSource}, int)"/> LINQ method.
+    /// </summary>
+    public int? Skip { get; set; }
+
+    /// <summary>
+    /// Gets how many items to take. Related to paging and the current page size. Usually used with the <see cref="Enumerable.Take{TSource}(IEnumerable{TSource}, int)"/> LINQ method.
+    /// </summary>
+    /// <value>The top.</value>
+    public int? Top { get; set; }
+
+    /// <summary>
+    /// Gets the filter expression as a string.
+    /// </summary>
+    /// <value>The filter.</value>
+    public string? Filter { get; internal set; }
+
+    /// <summary>
+    /// Gets or sets filter property used to limit and distinct values, if not set, args.Data are used as values.
+    /// </summary>
+    /// <value>The filter property.</value>
+    public string? Property { get; set; }
+
+    /// <summary>
+    /// Gets the RadzenDataGridColumn.
+    /// </summary>
+    public Radzen.Blazor.RadzenDataGridColumn<T>? Column { get; internal set; }
+}
+

Radzen.Blazor/DataGridLoadSettingsEventArgs.cs

@@ -0,0 +1,13 @@
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="Radzen.Blazor.RadzenDataGrid{TItem}.LoadSettings" /> event that is being raised.
+/// </summary>
+public class DataGridLoadSettingsEventArgs
+{
+    /// <summary>
+    /// Gets or sets the settings.
+    /// </summary>
+    public DataGridSettings? Settings { get; set; }
+}
+

Radzen.Blazor/DataGridPickedColumnsChangedEventArgs.cs

@@ -0,0 +1,17 @@
+using System.Collections.Generic;
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="RadzenDataGrid{TItem}.PickedColumnsChanged" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridPickedColumnsChangedEventArgs<T> where T : notnull
+{
+    /// <summary>
+    /// Gets the picked columns.
+    /// </summary>
+    public IEnumerable<RadzenDataGridColumn<T>>? Columns { get; internal set; }
+}
+

Radzen.Blazor/DataGridRenderEventArgs.cs

@@ -0,0 +1,22 @@
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="RadzenDataGrid{TItem}.Render" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridRenderEventArgs<T> where T : notnull
+{
+    /// <summary>
+    /// Gets the instance of the RadzenDataGrid component which has rendered.
+    /// </summary>
+    public RadzenDataGrid<T>? Grid { get; internal set; }
+
+    /// <summary>
+    /// Gets a value indicating whether this is the first time the RadzenDataGrid has rendered.
+    /// </summary>
+    /// <value><c>true</c> if this is the first time; otherwise, <c>false</c>.</value>
+    public bool FirstRender { get; internal set; }
+}
+

Radzen.Blazor/DataGridRowMouseEventArgs.cs

@@ -0,0 +1,14 @@
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="Radzen.Blazor.RadzenDataGrid{TItem}.RowClick" /> or <see cref="Radzen.Blazor.RadzenDataGrid{TItem}.RowDoubleClick" /> event that is being raised.
+/// </summary>
+/// <typeparam name="T">The data item type.</typeparam>
+public class DataGridRowMouseEventArgs<T> : Microsoft.AspNetCore.Components.Web.MouseEventArgs
+{
+    /// <summary>
+    /// Gets the data item which the clicked DataGrid row represents.
+    /// </summary>
+    public T? Data { get; internal set; }
+}
+

Radzen.Blazor/DataGridSelectionMode.cs

@@ -0,0 +1,18 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the selection mode behavior of <see cref="Radzen.Blazor.RadzenDataGrid{TItem}" />.
+/// </summary>
+public enum DataGridSelectionMode
+{
+    /// <summary>
+    /// The user can select only one row at a time. Selecting a different row deselects the last selected row.
+    /// </summary>
+    Single,
+
+    /// <summary>
+    /// The user can select multiple rows.
+    /// </summary>
+    Multiple
+}
+

Radzen.Blazor/DataGridSettings.cs

@@ -0,0 +1,30 @@
+using System.Collections.Generic;
+
+namespace Radzen;
+
+/// <summary>
+/// DataGrid settings class used to Save/Load settings.
+/// </summary>
+public class DataGridSettings
+{
+    /// <summary>
+    /// Columns.
+    /// </summary>
+    public IEnumerable<DataGridColumnSettings> Columns { get; set; } = System.Array.Empty<DataGridColumnSettings>();
+
+    /// <summary>
+    /// Groups.
+    /// </summary>
+    public IEnumerable<GroupDescriptor> Groups { get; set; } = System.Array.Empty<GroupDescriptor>();
+
+    /// <summary>
+    /// CurrentPage.
+    /// </summary>
+    public int? CurrentPage { get; set; }
+
+    /// <summary>
+    /// PageSize.
+    /// </summary>
+    public int? PageSize { get; set; }
+}
+

Radzen.Blazor/DateRenderEventArgs.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="Radzen.Blazor.RadzenDatePicker{TValue}.DateRender" /> event that is being raised.
+/// </summary>
+public class DateRenderEventArgs
+{
+    /// <summary>
+    /// Gets or sets the HTML attributes that will be applied to item HTML element.
+    /// </summary>
+    /// <example>
+    /// void OnDateRender(DateRenderEventArgs args)
+    /// {
+    ///     args.Attributes["style"] = "background-color: red; color: black;";
+    /// }
+    /// </example>
+    /// <value>The attributes.</value>
+    public IDictionary<string, object> Attributes { get; private set; } = new Dictionary<string, object>();
+
+    /// <summary>
+    /// Gets the date which the rendered item represents.
+    /// </summary>
+    public DateTime Date { get; internal set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the rendered item is disabled.
+    /// </summary>
+    /// <value><c>true</c> if disabled; otherwise, <c>false</c>.</value>
+    public bool Disabled { get; set; }
+}
+

Radzen.Blazor/DateScale.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Globalization;
 using System.Linq;
 using System.Collections.Generic;
 
@@ -50,14 +51,14 @@ namespace Radzen.Blazor
         {
             if (min != null)
             {
-                var minDate = Convert.ToDateTime(min);
+                var minDate = Convert.ToDateTime(min, CultureInfo.InvariantCulture);
                 Input.Start = minDate.Ticks;
                 Round = false;
             }
 
             if (max != null)
             {
-                var maxDate = Convert.ToDateTime(max);
+                var maxDate = Convert.ToDateTime(max, CultureInfo.InvariantCulture);
                 Input.End = maxDate.Ticks;
                 Round = false;
             }

Radzen.Blazor/Debouncer.cs

@@ -0,0 +1,112 @@
+using System;
+using System.Threading.Tasks;
+
+namespace Radzen;
+
+/// <summary>
+/// Utility class for debouncing and throttling function calls.
+/// </summary>
+internal class Debouncer : IDisposable
+{
+    private System.Timers.Timer? timer;
+    private System.Timers.ElapsedEventHandler? timerElapsedHandler;
+    private DateTime timerStarted { get; set; } = DateTime.UtcNow.AddYears(-1);
+
+    /// <summary>
+    /// Debounces the specified action.
+    /// </summary>
+    /// <param name="interval">The debounce interval in milliseconds.</param>
+    /// <param name="action">The action to debounce.</param>
+    public void Debounce(int interval, Func<Task> action)
+    {
+        ClearTimer();
+        timer = new System.Timers.Timer() { Interval = interval, Enabled = false, AutoReset = false };
+        timerElapsedHandler = (s, e) =>
+        {
+            if (timer == null)
+            {
+                return;
+            }
+
+            timer?.Stop();
+            timer = null;
+
+            try
+            {
+                Task.Run(action);
+            }
+            catch (TaskCanceledException)
+            {
+                //
+            }
+        };
+        timer.Elapsed += timerElapsedHandler;
+
+        timer.Start();
+    }
+
+    /// <summary>
+    /// Throttles the specified action.
+    /// </summary>
+    /// <param name="interval">The throttle interval in milliseconds.</param>
+    /// <param name="action">The action to throttle.</param>
+    public void Throttle(int interval, Func<Task> action)
+    {
+        ClearTimer();
+        var curTime = DateTime.UtcNow;
+
+        if (curTime.Subtract(timerStarted).TotalMilliseconds < interval)
+        {
+            interval -= (int)curTime.Subtract(timerStarted).TotalMilliseconds;
+        }
+
+        timer = new System.Timers.Timer() { Interval = interval, Enabled = false, AutoReset = false };
+        timerElapsedHandler = (s, e) =>
+        {
+            if (timer == null)
+            {
+                return;
+            }
+
+            timer?.Stop();
+            timer = null;
+
+            try
+            {
+                Task.Run(action);
+            }
+            catch (TaskCanceledException)
+            {
+                //
+            }
+        };
+        timer.Elapsed += timerElapsedHandler;
+
+        timer.Start();
+        timerStarted = curTime;
+    }
+
+    /// <inheritdoc />
+    public void Dispose()
+    {
+        ClearTimer();
+    }
+
+    private void ClearTimer()
+    {
+        if (timer == null)
+        {
+            return;
+        }
+
+        if (timerElapsedHandler != null)
+        {
+            timer.Elapsed -= timerElapsedHandler;
+            timerElapsedHandler = null;
+        }
+
+        timer.Stop();
+        timer.Dispose();
+        timer = null;
+    }
+}

Radzen.Blazor/Density.cs

@@ -0,0 +1,18 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies component density.
+/// </summary>
+public enum Density
+{
+    /// <summary>
+    /// The default density.
+    /// </summary>
+    Default,
+
+    /// <summary>
+    /// А high density compact mode.
+    /// </summary>
+    Compact
+}
+

Radzen.Blazor/Directory.Build.props

@@ -0,0 +1,85 @@
+<Project>
+  <!-- 
+    Common build properties for all projects in the Radzen.Blazor solution.
+    
+    To use this file:
+    1. Rename to Directory.Build.props (remove .sample extension)
+    2. Adjust settings based on your needs
+    3. Review the analyzer settings in .editorconfig
+    
+    This file will be automatically imported by all projects in subdirectories.
+  -->
+
+  <PropertyGroup Label="Language Configuration">
+    <!-- Use latest C# language features -->
+    <LangVersion>latest</LangVersion>
+    
+    <!-- Do NOT enable implicit usings - explicit imports preferred for library code -->
+    <ImplicitUsings>disable</ImplicitUsings>
+    
+    <Nullable>enable</Nullable>
+    <NoWarn>CA2007</NoWarn>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Code Analysis Configuration">
+    <!-- Enable .NET code analyzers -->
+    <AnalysisLevel>latest</AnalysisLevel>
+    <EnableNETAnalyzers>true</EnableNETAnalyzers>
+    
+    <!-- Run analyzers during build and in IDE -->
+    <RunAnalyzersDuringBuild>true</RunAnalyzersDuringBuild>
+    <RunAnalyzersDuringLiveAnalysis>true</RunAnalyzersDuringLiveAnalysis>
+    
+    <!-- Don't enforce code style in build (yet) - just show warnings -->
+    <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+    
+    <!-- Don't treat warnings as errors (yet) - too many to fix immediately -->
+    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    
+    <!-- Report all analyzer diagnostics -->
+    <AnalysisMode>All</AnalysisMode>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Build Quality">
+    <!-- Enable deterministic builds for reproducibility -->
+    <Deterministic>true</Deterministic>
+    
+    <!-- Enable deterministic builds in CI/CD -->
+    <ContinuousIntegrationBuild Condition="'$(CI)' == 'true'">true</ContinuousIntegrationBuild>
+    
+    <!-- Embed source files for better debugging -->
+    <EmbedAllSources>true</EmbedAllSources>
+    <!--
+      IMPORTANT:
+      - NuGet symbol packages (.snupkg) require portable PDB files.
+      - If DebugType=embedded, there are no standalone PDBs, so the .snupkg ends up effectively empty.
+      Use portable PDBs when symbols are enabled; otherwise use embedded for local debugging convenience.
+    -->
+    <!--
+      NOTE: Directory.Build.props is imported before project files, so properties like IncludeSymbols
+      set in a .csproj may not be available yet for Conditions here.
+      IsPacking *is* set by `dotnet pack`, so use that to switch DebugType for symbol packages.
+    -->
+    <DebugType Condition="'$(IsPacking)' == 'true'">portable</DebugType>
+    <DebugType Condition="'$(IsPacking)' != 'true'">embedded</DebugType>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Demos and Tests Project Configuration" Condition="$(MSBuildProjectName.Contains('Demos')) OR $(MSBuildProjectName.Contains('Tests'))">
+    <!-- Demo projects and Tests should not be packable -->
+    <IsPackable>false</IsPackable>
+    
+    <!-- DISABLE ALL ANALYZERS FOR DEMO PROJECTS AND TESTS -->
+    <EnableNETAnalyzers>false</EnableNETAnalyzers>
+    <RunAnalyzersDuringBuild>false</RunAnalyzersDuringBuild>
+    <RunAnalyzersDuringLiveAnalysis>false</RunAnalyzersDuringLiveAnalysis>
+    <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+  </PropertyGroup>
+
+  <PropertyGroup Label="Performance">
+    <!-- Optimize startup time -->
+    <TieredCompilation>true</TieredCompilation>
+    <TieredCompilationQuickJit>true</TieredCompilationQuickJit>
+  </PropertyGroup>
+
+</Project>
+

Radzen.Blazor/DropDownBase.cs

@@ -1,7 +1,6 @@
-using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Rendering;
 using Microsoft.JSInterop;
-using Radzen.Blazor;
 using System;
 using System.Collections;
 using System.Collections.Generic;
@@ -22,12 +21,12 @@ namespace Radzen
         [Parameter]
         public int VirtualizationOverscanCount { get; set; }
 
-        internal Microsoft.AspNetCore.Components.Web.Virtualization.Virtualize<object> virtualize;
+        internal Microsoft.AspNetCore.Components.Web.Virtualization.Virtualize<object>? virtualize;
 
         /// <summary>
         /// The Virtualize instance.
         /// </summary>
-        public Microsoft.AspNetCore.Components.Web.Virtualization.Virtualize<object> Virtualize
+        public Microsoft.AspNetCore.Components.Web.Virtualization.Virtualize<object>? Virtualize
         {
             get
             {
@@ -35,12 +34,12 @@ namespace Radzen
             }
         }
 
-        List<object> virtualItems;
+        List<object>? virtualItems;
 
         private async ValueTask<Microsoft.AspNetCore.Components.Web.Virtualization.ItemsProviderResult<object>> LoadItems(Microsoft.AspNetCore.Components.Web.Virtualization.ItemsProviderRequest request)
         {
             var data = Data != null ? Data.Cast<object>() : Enumerable.Empty<object>();
-            var view = (LoadData.HasDelegate ? data : View).Cast<object>().AsQueryable();
+            var view = (LoadData.HasDelegate ? data : View)?.Cast<object>().AsQueryable() ?? Enumerable.Empty<object>().AsQueryable();
             var totalItemsCount = LoadData.HasDelegate ? Count : view.Count();
             var top = request.Count;
 
@@ -54,7 +53,7 @@ namespace Radzen
                 await LoadData.InvokeAsync(new Radzen.LoadDataArgs() { Skip = request.StartIndex, Top = top, Filter = searchText });
             }
 
-            virtualItems = (LoadData.HasDelegate ? Data : view.Skip(request.StartIndex).Take(top)).Cast<object>().ToList();
+            virtualItems = (LoadData.HasDelegate ? (Data ?? Enumerable.Empty<object>()) : view.Skip(request.StartIndex).Take(top)).Cast<object>().ToList();
 
             return new Microsoft.AspNetCore.Components.Web.Virtualization.ItemsProviderResult<object>(virtualItems, LoadData.HasDelegate ? Count : totalItemsCount);
         }
@@ -105,13 +104,13 @@ namespace Radzen
                     builder.AddAttribute(1, "ItemsProvider", new Microsoft.AspNetCore.Components.Web.Virtualization.ItemsProviderDelegate<object>(LoadItems));
                     builder.AddAttribute(2, "ChildContent", (RenderFragment<object>)((context) =>
                     {
-                        return (RenderFragment)((b) =>
+                        return b =>
                         {
                             RenderItem(b, context);
-                        });
+                        };
                     }));
 
-                    if (VirtualizationOverscanCount != default(int))
+                    if (VirtualizationOverscanCount != default)
                     {
                         builder.AddAttribute(3, "OverscanCount", VirtualizationOverscanCount);
                     }
@@ -122,9 +121,13 @@ namespace Radzen
                 }
                 else
                 {
-                    foreach (var item in LoadData.HasDelegate ? Data : View)
+                    var items = LoadData.HasDelegate ? Data : View;
+                    if (items != null)
                     {
-                        RenderItem(builder, item);
+                        foreach (var item in items)
+                        {
+                            RenderItem(builder, item);
+                        }
                     }
                 }
             });
@@ -160,21 +163,18 @@ namespace Radzen
             //
         }
 
-        System.Collections.Generic.HashSet<object> keys = new System.Collections.Generic.HashSet<object>();
+        HashSet<object> keys = new HashSet<object>();
 
-        internal object GetKey(object item)
+        internal object? GetKey(object item)
         {
-            var value = GetItemOrValueFromProperty(item, ValueProperty);
+            var value = GetItemOrValueFromProperty(item, ValueProperty ?? string.Empty);
 
-            if (!keys.Contains(value))
+            if (value != null)
             {
                 keys.Add(value);
-                return value;
-            }
-            else
-            {
-                return item;
             }
+
+            return value;
         }
 
         /// <summary>
@@ -182,7 +182,7 @@ namespace Radzen
         /// </summary>
         /// <value>The header template.</value>
         [Parameter]
-        public RenderFragment HeaderTemplate { get; set; }
+        public RenderFragment? HeaderTemplate { get; set; }
 
         /// <summary>
         /// Gets or sets a value indicating whether filtering is allowed. Set to <c>false</c> by default.
@@ -231,21 +231,21 @@ namespace Radzen
         /// </summary>
         /// <value>The template.</value>
         [Parameter]
-        public RenderFragment<dynamic> Template { get; set; }
+        public RenderFragment<dynamic>? Template { get; set; }
 
         /// <summary>
         /// Gets or sets the value property.
         /// </summary>
         /// <value>The value property.</value>
         [Parameter]
-        public string ValueProperty { get; set; }
+        public string? ValueProperty { get; set; }
 
         /// <summary>
         /// Gets or sets the disabled property.
         /// </summary>
         /// <value>The disabled property.</value>
         [Parameter]
-        public string DisabledProperty { get; set; }
+        public string? DisabledProperty { get; set; }
 
         /// <summary>
         /// Gets or sets the remove chip button title.
@@ -254,6 +254,13 @@ namespace Radzen
         [Parameter]
         public string RemoveChipTitle { get; set; } = "Remove";
 
+        /// <summary>
+        /// Gets or sets the clear button aria label text.
+        /// </summary>
+        /// <value>The clear button aria label text.</value>
+        [Parameter]
+        public string ClearAriaLabel { get; set; } = "Clear";
+
         /// <summary>
         /// Gets or sets the search aria label text.
         /// </summary>
@@ -282,7 +289,7 @@ namespace Radzen
         /// <summary>
         /// The selected item
         /// </summary>
-        protected object selectedItem = null;
+        protected object? selectedItem;
         Type GetItemType(IEnumerable items)
         {
             var firstType = items.Cast<object>().FirstOrDefault()?.GetType() ?? typeof(object);
@@ -301,7 +308,7 @@ namespace Radzen
         /// </summary>
         protected virtual async System.Threading.Tasks.Task SelectAll()
         {
-            if (Disabled)
+            if (Disabled || View == null)
             {
                 return;
             }
@@ -316,11 +323,14 @@ namespace Radzen
                 selectedItems.Clear();
             }
 
-            if (!string.IsNullOrEmpty(ValueProperty))
+            if (!string.IsNullOrEmpty(ValueProperty) && Data != null)
             {
                 var elementType = PropertyAccess.GetElementType(Data.GetType());
-                System.Reflection.PropertyInfo pi = PropertyAccess.GetProperty(elementType, ValueProperty);
-                internalValue = selectedItems.Select(i => GetItemOrValueFromProperty(i, ValueProperty)).AsQueryable().Cast(pi.PropertyType);
+                System.Reflection.PropertyInfo? pi = PropertyAccess.GetProperty(elementType, ValueProperty);
+                if (pi != null)
+                {
+                    internalValue = selectedItems.Select(i => GetItemOrValueFromProperty(i, ValueProperty)).AsQueryable().Cast(pi.PropertyType);
+                }
             }
             else
             {
@@ -329,25 +339,34 @@ namespace Radzen
                 internalValue = selectedItems.AsQueryable().Cast(type);
             }
 
-            await collectionAssignment.MakeAssignment((IEnumerable)internalValue, ValueChanged);
+            if (internalValue != null)
+            {
+                await collectionAssignment.MakeAssignment((IEnumerable)internalValue, ValueChanged);
+            }
             if (FieldIdentifier.FieldName != null) { EditContext?.NotifyFieldChanged(FieldIdentifier); }
             await Change.InvokeAsync(internalValue);
 
             StateHasChanged();
 
-            await JSRuntime.InvokeVoidAsync("Radzen.focusElement", GetId());
+            if (JSRuntime != null)
+            {
+                await JSRuntime.InvokeVoidAsync("Radzen.focusElement", GetId());
+            }
         }
 
         internal bool IsAllSelected()
         {
-            List<object> notDisabledItemsInList = View.Cast<object>().ToList()
+            List<object> notDisabledItemsInList = View != null ? View.Cast<object>().ToList()
                 .Where(i => disabledPropertyGetter == null || disabledPropertyGetter(i) as bool? != true)
-                .ToList();
+                .ToList() : new List<object>();
 
             if (LoadData.HasDelegate && !string.IsNullOrEmpty(ValueProperty))
             {
                 return View != null && notDisabledItemsInList.Count > 0 && notDisabledItemsInList
-                    .All(i => IsItemSelectedByValue(GetItemOrValueFromProperty(i, ValueProperty)));
+                    .All(i => { 
+                        var value = GetItemOrValueFromProperty(i, ValueProperty);
+                        return value != null ? IsItemSelectedByValue(value) : false;
+                    });
             }
 
             return View != null && notDisabledItemsInList.Count > 0 && selectedItems.Count == notDisabledItemsInList.Count;
@@ -365,14 +384,17 @@ namespace Radzen
         /// <summary>
         /// Clears all.
         /// </summary>
-        protected async System.Threading.Tasks.Task ClearAll()
+        protected async Task ClearAll()
         {
             if (Disabled)
                 return;
 
             searchText = null;
             await SearchTextChanged.InvokeAsync(searchText);
-            await JSRuntime.InvokeAsync<string>("Radzen.setInputValue", search, "");
+            if (JSRuntime != null)
+            {
+                await JSRuntime.InvokeAsync<string>("Radzen.setInputValue", search, "");
+            }
 
             internalValue = collectionAssignment.GetCleared();
             selectedItem = null;
@@ -381,7 +403,7 @@ namespace Radzen
 
             selectedIndex = -1;
 
-            await ValueChanged.InvokeAsync((T)internalValue);
+            await ValueChanged.InvokeAsync(internalValue != null ? (T)internalValue : default(T)!);
             if (FieldIdentifier.FieldName != null) { EditContext?.NotifyFieldChanged(FieldIdentifier); }
             await Change.InvokeAsync(internalValue);
 
@@ -393,14 +415,14 @@ namespace Radzen
         /// <summary>
         /// The data
         /// </summary>
-        IEnumerable _data;
+        IEnumerable? _data;
 
         /// <summary>
         /// Gets or sets the data.
         /// </summary>
         /// <value>The data.</value>
         [Parameter]
-        public override IEnumerable Data
+        public override IEnumerable? Data
         {
             get
             {
@@ -466,22 +488,26 @@ namespace Radzen
             }
         }
 
-        Func<object, object> GetGetter(string propertyName, Type type)
+        Func<object, object?> GetGetter(string propertyName, Type type)
         {
-            if (propertyName?.Contains("[") == true)
+            if (propertyName?.Contains('[', StringComparison.Ordinal) == true)
             {
                 var getter = typeof(PropertyAccess).GetMethod("Getter", [typeof(string), typeof(Type)]);
+                if (getter == null)
+                {
+                    return PropertyAccess.Getter<object, object?>(propertyName, type);
+                }
                 var getterMethod = getter.MakeGenericMethod([type, typeof(object)]);
 
-                return (i) => getterMethod.Invoke(i, [propertyName, type]);
+                return (i) => getterMethod.Invoke(i, [propertyName, type])!;
             }
 
-            return PropertyAccess.Getter<object, object>(propertyName, type);
+            return PropertyAccess.Getter<object, object?>(propertyName ?? string.Empty, type);
         }
 
-        internal Func<object, object> valuePropertyGetter;
-        internal Func<object, object> textPropertyGetter;
-        internal Func<object, object> disabledPropertyGetter;
+        internal Func<object, object?>? valuePropertyGetter;
+        internal Func<object, object?>? textPropertyGetter;
+        internal Func<object, object?>? disabledPropertyGetter;
 
         /// <summary>
         /// Gets the item or value from property.
@@ -489,7 +515,7 @@ namespace Radzen
         /// <param name="item">The item.</param>
         /// <param name="property">The property.</param>
         /// <returns>System.Object.</returns>
-        public object GetItemOrValueFromProperty(object item, string property)
+        public virtual object? GetItemOrValueFromProperty(object? item, string property)
         {
             if (item != null)
             {
@@ -539,6 +565,18 @@ namespace Radzen
             }
         }
 
+        /// <summary>
+        /// Gets the listbox identifier.
+        /// </summary>
+        /// <value>The listbox identifier.</value>
+        protected string ListId
+        {
+            get
+            {
+                return $"{GetId()}-list";
+            }
+        }
+
         /// <summary>
         /// Gets the search identifier.
         /// </summary>
@@ -610,16 +648,21 @@ namespace Radzen
             if (Disabled)
                 return;
 
-            await JSRuntime.InvokeVoidAsync("Radzen.togglePopup", Element, PopupID, true);
-            await JSRuntime.InvokeVoidAsync("Radzen.focusElement", isFilter ? UniqueID : SearchID);
+            if (JSRuntime != null)
+            {
+                await JSRuntime.InvokeVoidAsync("Radzen.togglePopup", Element, PopupID, true);
+                await JSRuntime.InvokeVoidAsync("Radzen.focusElement", isFilter ? UniqueID : SearchID);
+            }
 
-            if (list != null)
+            isPopupOpen = true;
+
+            if (list != null && JSRuntime != null)
             {
                 await JSRuntime.InvokeVoidAsync("Radzen.selectListItem", search, list, selectedIndex);
             }
         }
 
-        internal bool preventKeydown = false;
+        internal bool preventKeydown;
 
         /// <summary>
         /// Handles the key press.
@@ -627,9 +670,13 @@ namespace Radzen
         /// <param name="args">The <see cref="Microsoft.AspNetCore.Components.Web.KeyboardEventArgs"/> instance containing the event data.</param>
         /// <param name="isFilter">if set to <c>true</c> [is filter].</param>
         /// <param name="shouldSelectOnChange">Should select item on item change with keyboard.</param>
-        protected virtual async System.Threading.Tasks.Task HandleKeyPress(Microsoft.AspNetCore.Components.Web.KeyboardEventArgs args, bool isFilter = false, bool? shouldSelectOnChange = null)
+        protected virtual async Task HandleKeyPress(Microsoft.AspNetCore.Components.Web.KeyboardEventArgs args, bool isFilter = false, bool? shouldSelectOnChange = null)
         {
-            if (Disabled || Data == null)
+            ArgumentNullException.ThrowIfNull(args);
+
+            var key = args.Code != null ? args.Code : args.Key;
+
+            if (Disabled || Data == null || args == null || key == null)
                 return;
 
             List<object> items = Enumerable.Empty<object>().ToList();
@@ -649,28 +696,29 @@ namespace Radzen
                 }
                 else
                 {
-                    items = View.Cast<object>().ToList();
+                    items = View != null ? View.Cast<object>().ToList() : Enumerable.Empty<object>().ToList();
                 }
             }
 
-            var key = args.Code != null ? args.Code : args.Key;
-
             if (!args.AltKey && (key == "ArrowDown" || key == "ArrowLeft" || key == "ArrowUp" || key == "ArrowRight"))
             {
                 preventKeydown = true;
 
                 try
                 {
-                    selectedIndex = await JSRuntime.InvokeAsync<int>("Radzen.focusListItem", search, list, key == "ArrowDown" || key == "ArrowRight", selectedIndex);
-
-                    var popupOpened = await JSRuntime.InvokeAsync<bool>("Radzen.popupOpened", PopupID);
-
-                    if (!Multiple && !popupOpened && shouldSelectOnChange != false)
+                    if (JSRuntime != null)
                     {
-                        var itemToSelect = items.ElementAtOrDefault(selectedIndex);
-                        if (itemToSelect != null)
+                        selectedIndex = await JSRuntime.InvokeAsync<int>("Radzen.focusListItem", search, list, key == "ArrowDown" || key == "ArrowRight", selectedIndex);
+
+                        var popupOpened = await JSRuntime.InvokeAsync<bool>("Radzen.popupOpened", PopupID);
+
+                        if (!Multiple && !popupOpened && shouldSelectOnChange != false)
                         {
-                            await OnSelectItem(itemToSelect, true);
+                            var itemToSelect = items.ElementAtOrDefault(selectedIndex);
+                            if (itemToSelect != null)
+                            {
+                                await OnSelectItem(itemToSelect, true);
+                            }
                         }
                     }
                 }
@@ -683,32 +731,40 @@ namespace Radzen
             {
                 preventKeydown = true;
 
-                if (selectedIndex >= 0 && selectedIndex <= items.Count() - 1)
+                if (selectedIndex == -1 && items.Count == 1)
                 {
-                    var itemToSelect = items.ElementAtOrDefault(selectedIndex);
-
-                    await JSRuntime.InvokeAsync<string>("Radzen.setInputValue", search, $"{searchText}".Trim());
-
-                    if (itemToSelect != null)
-                    {
-                        await OnSelectItem(itemToSelect, true);
-                    }
+                    selectedIndex = 0;
                 }
 
-                var popupOpened = await JSRuntime.InvokeAsync<bool>("Radzen.popupOpened", PopupID);
+                if (JSRuntime != null)
+                {
+                    if (selectedIndex >= 0 && selectedIndex <= items.Count - 1)
+                    {
+                        var itemToSelect = items.ElementAtOrDefault(selectedIndex);
 
-                if (!popupOpened)
-                {
-                    if(key != "Space")
-                    {
-                        await OpenPopup(key, isFilter);
+                        await JSRuntime.InvokeAsync<string>("Radzen.setInputValue", search, $"{searchText}".Trim());
+
+                        if (itemToSelect != null)
+                        {
+                            await OnSelectItem(itemToSelect, true);
+                        }
                     }
-                }
-                else
-                {
-                    if (!Multiple && !isFilter)
+
+                    var popupOpened = await JSRuntime.InvokeAsync<bool>("Radzen.popupOpened", PopupID);
+
+                    if (!popupOpened)
                     {
-                        await ClosePopup(key);
+                        if (key != "Space")
+                        {
+                            await OpenPopup(key, isFilter);
+                        }
+                    }
+                    else
+                    {
+                        if (!Multiple && (!isFilter || key != "Space"))
+                        {
+                            await ClosePopup(key);
+                        }
                     }
                 }
             }
@@ -753,11 +809,20 @@ namespace Radzen
             else if (args.Key.Length == 1 && !args.CtrlKey && !args.AltKey && !args.ShiftKey)
             {
                 // searching for element
+                if (Query == null)
+                {
+                    return;
+                }
+                var query = Query;
+                var elementType = query.ElementType;
+                if (elementType == null)
+                {
+                    return;
+                }
                 var filteredItems = (!string.IsNullOrEmpty(TextProperty) ?
-                    Query.Where(TextProperty, args.Key, StringFilterOperator.StartsWith, FilterCaseSensitivity.CaseInsensitive) :
-                    Query)
-                    .Cast(Query.ElementType).Cast<dynamic>().ToList();
-
+                    query.Where(TextProperty, args.Key, StringFilterOperator.StartsWith, FilterCaseSensitivity.CaseInsensitive) :
+                    query)
+                    .Cast(elementType).Cast<dynamic>().ToList();
 
                 if (previousKey != args.Key)
                 {
@@ -765,7 +830,7 @@ namespace Radzen
                     itemIndex = -1;
                 }
 
-                itemIndex = itemIndex + 1 >= filteredItems.Count() ? 0 : itemIndex + 1;
+                itemIndex = itemIndex + 1 >= filteredItems.Count ? 0 : itemIndex + 1;
                 var itemToSelect = filteredItems.ElementAtOrDefault(itemIndex);
 
                 if (itemToSelect is not null)
@@ -782,7 +847,10 @@ namespace Radzen
                         {
                             selectedIndex = result.Index;
                         }
-                        await JSRuntime.InvokeVoidAsync("Radzen.selectListItem", list, list, result.Index);
+                        if (JSRuntime != null)
+                        {
+                            await JSRuntime.InvokeVoidAsync("Radzen.selectListItem", list, list, result.Index);
+                        }
                     }
                 }
 
@@ -792,14 +860,24 @@ namespace Radzen
 
         internal virtual async Task ClosePopup(string key)
         {
-            await JSRuntime.InvokeVoidAsync("Radzen.closePopup", PopupID);
+            if (JSRuntime != null)
+            {
+                await JSRuntime.InvokeVoidAsync("Radzen.closePopup", PopupID);
+            }
+
+            isPopupOpen = false;
         }
 
+        /// <summary>
+        /// Gets a value indicating whether the popup is open.
+        /// </summary>
+        protected bool isPopupOpen;
+
         int itemIndex;
-        string previousKey;
+        string? previousKey;
 
         /// <summary>
-        /// Handles the <see cref="E:FilterKeyPress" /> event.
+        /// Handles the FilterKeyPress event.
         /// </summary>
         /// <param name="args">The <see cref="Microsoft.AspNetCore.Components.Web.KeyboardEventArgs"/> instance containing the event data.</param>
         protected virtual async System.Threading.Tasks.Task OnFilterKeyPress(Microsoft.AspNetCore.Components.Web.KeyboardEventArgs args)
@@ -849,13 +927,15 @@ namespace Radzen
 
             if (Multiple)
                 selectedIndex = -1;
-
-            await JSRuntime.InvokeAsync<string>("Radzen.repositionPopup", Element, PopupID);
+            if (JSRuntime != null)
+            {
+                await JSRuntime.InvokeAsync<string>("Radzen.repositionPopup", Element, PopupID);
+            }
             await InvokeAsync(() => SearchTextChanged.InvokeAsync(SearchText));
         }
 
         /// <summary>
-        /// Handles the <see cref="E:KeyPress" /> event.
+        /// Handles the KeyPress event.
         /// </summary>
         /// <param name="args">The <see cref="Microsoft.AspNetCore.Components.Web.KeyboardEventArgs"/> instance containing the event data.</param>
         /// <param name="shouldSelectOnChange">Should select item on item change with keyboard.</param>
@@ -869,13 +949,13 @@ namespace Radzen
         /// </summary>
         /// <param name="item">The item.</param>
         /// <param name="isFromKey">if set to <c>true</c> [is from key].</param>
-        protected virtual async System.Threading.Tasks.Task OnSelectItem(object item, bool isFromKey = false)
+        protected virtual async System.Threading.Tasks.Task OnSelectItem(object? item, bool isFromKey = false)
         {
             await SelectItem(item);
         }
 
         /// <summary>
-        /// Handles the <see cref="E:Filter" /> event.
+        /// Handles the Filter event.
         /// </summary>
         /// <param name="args">The <see cref="ChangeEventArgs"/> instance containing the event data.</param>
         protected virtual async System.Threading.Tasks.Task OnFilter(ChangeEventArgs args)
@@ -886,6 +966,25 @@ namespace Radzen
             }
         }
 
+        /// <summary>
+        /// Handles filter input changes (e.g. paste).
+        /// </summary>
+        /// <param name="args">The <see cref="ChangeEventArgs"/> instance containing the event data.</param>
+        protected virtual async Task OnFilterInput(ChangeEventArgs args)
+        {
+            ArgumentNullException.ThrowIfNull(args);
+
+            searchText = $"{args.Value}"; 
+            await SearchTextChanged.InvokeAsync(searchText);
+
+            if (ResetSelectedIndexOnFilter)
+            {
+                selectedIndex = -1;
+            }
+
+            Debounce(DebounceFilter, FilterDelay);
+        }
+
         /// <summary>
         /// Gets the load data arguments.
         /// </summary>
@@ -943,7 +1042,7 @@ namespace Radzen
             if (valueChanged)
             {
                 internalValue = parameters.GetValueOrDefault<object>(nameof(Value));
-                if (PreserveCollectionOnSelection)
+                if (PreserveCollectionOnSelection && internalValue != null)
                 {
                     collectionAssignment = new ReferenceGenericCollectionAssignment((T)internalValue);
                 }
@@ -966,7 +1065,7 @@ namespace Radzen
             }
 
             var shouldClose = visibleChanged && !Visible;
-            if (shouldClose && !firstRender)
+            if (shouldClose && !firstRender && JSRuntime != null)
             {
                 await JSRuntime.InvokeVoidAsync("Radzen.destroyPopup", PopupID);
             }
@@ -987,19 +1086,26 @@ namespace Radzen
                     selectedItems.Clear();
                 }
             }
+            else if (internalValue == null && Multiple && selectedItems.Count > 0)
+            {
+                selectedItems.Clear();
+            }
 
-            SelectItemFromValue(internalValue);
+                SelectItemFromValue(internalValue);
 
             return base.OnParametersSetAsync();
         }
 
         /// <summary>
-        /// Handles the <see cref="E:Change" /> event.
+        /// Handles the Change event.
         /// </summary>
         /// <param name="args">The <see cref="ChangeEventArgs"/> instance containing the event data.</param>
         protected void OnChange(ChangeEventArgs args)
         {
-            internalValue = args.Value;
+            if (args != null)
+            {
+                internalValue = args.Value;
+            }
         }
 
         /// <summary>
@@ -1007,17 +1113,18 @@ namespace Radzen
         /// </summary>
         /// <param name="item">The item.</param>
         /// <returns><c>true</c> if the specified item is selected; otherwise, <c>false</c>.</returns>
-        internal bool IsSelected(object item)
+        internal bool IsSelected(object? item)
         {
             if (!string.IsNullOrEmpty(ValueProperty))
             {
-                return IsItemSelectedByValue(GetItemOrValueFromProperty(item, ValueProperty));
+                var value = GetItemOrValueFromProperty(item, ValueProperty);
+                return value != null ? IsItemSelectedByValue(value) : false;
             }
             else
             {
                 if (Multiple)
                 {
-                    return selectedItems.Contains(item);
+                    return selectedItems.Contains(item!);
                 }
                 else
                 {
@@ -1031,7 +1138,7 @@ namespace Radzen
         /// </summary>
         /// <value>The selected item.</value>
         [Parameter]
-        public object SelectedItem
+        public object? SelectedItem
         {
             get
             {
@@ -1069,13 +1176,13 @@ namespace Radzen
         /// Gets the view.
         /// </summary>
         /// <value>The view.</value>
-        protected override IEnumerable View
+        protected override IEnumerable? View
         {
             get
             {
                 if (_view == null && Query != null)
                 {
-                    _view = Query.Where(TextProperty, searchText, FilterOperator, FilterCaseSensitivity);
+                    _view = Query.Where(TextProperty ?? string.Empty, searchText, FilterOperator, FilterCaseSensitivity);
                 }
 
                 return _view;
@@ -1087,7 +1194,7 @@ namespace Radzen
         /// </summary>
         void SetSelectedIndexFromSelectedItem()
         {
-            if (selectedItem != null)
+            if (selectedItem != null && View != null)
             {
                 if (typeof(EnumerableQuery).IsAssignableFrom(View.GetType()))
                 {
@@ -1109,17 +1216,17 @@ namespace Radzen
         /// </summary>
         /// <param name="item">The item.</param>
         /// <param name="raiseChange">if set to <c>true</c> [raise change].</param>
-        internal async System.Threading.Tasks.Task SelectItemInternal(object item, bool raiseChange = true)
+        internal async Task SelectItemInternal(object item, bool raiseChange = true)
         {
             await SelectItem(item, raiseChange);
         }
 
-        internal object internalValue;
+        internal object? internalValue;
         
         /// <summary>
         /// Will add/remove selected items from a bound ICollection&lt;T&gt;, instead of replacing it.
         /// </summary>
-        protected bool PreserveCollectionOnSelection = false;
+        protected bool PreserveCollectionOnSelection;
         private DefaultCollectionAssignment collectionAssignment = new();
 
         /// <summary>
@@ -1127,7 +1234,7 @@ namespace Radzen
         /// </summary>
         /// <param name="item">The item.</param>
         /// <param name="raiseChange">if set to <c>true</c> [raise change].</param>
-        public async System.Threading.Tasks.Task SelectItem(object item, bool raiseChange = true)
+        public async Task SelectItem(object? item, bool raiseChange = true)
         {
             if (disabledPropertyGetter != null && item != null && disabledPropertyGetter(item) as bool? == true)
             {
@@ -1140,7 +1247,7 @@ namespace Radzen
                     return;
 
                 selectedItem = item;
-                if (!string.IsNullOrEmpty(ValueProperty))
+                if (!string.IsNullOrEmpty(ValueProperty) && item != null)
                 {
                     internalValue = PropertyAccess.GetItemOrValueFromProperty(item, ValueProperty);
                 }
@@ -1155,16 +1262,23 @@ namespace Radzen
             }
             else
             {
-                UpdateSelectedItems(item);
+                UpdateSelectedItems(item!);
 
-                if (!string.IsNullOrEmpty(ValueProperty))
+                if (!string.IsNullOrEmpty(ValueProperty) && Data != null)
                 {
                     var elementType = PropertyAccess.GetElementType(Data.GetType());
-                    System.Reflection.PropertyInfo pi = PropertyAccess.GetProperty(elementType, ValueProperty);
-                    internalValue = selectedItems.Select(i => GetItemOrValueFromProperty(i, ValueProperty)).AsQueryable().Cast(pi.PropertyType);
+                    System.Reflection.PropertyInfo? pi = PropertyAccess.GetProperty(elementType, ValueProperty);
+                    if(pi != null)
+                    {
+                        internalValue = selectedItems.Select(i => GetItemOrValueFromProperty(i, ValueProperty)).AsQueryable().Cast(pi.PropertyType);
+                    }
                 }
                 else
                 {
+                    if (Data == null)
+                    {
+                        return;
+                    }
                     var query = Data.AsQueryable();
                     var elementType = query.ElementType;
 
@@ -1193,11 +1307,14 @@ namespace Radzen
                 {
                     if (Multiple)
                     {
-                        await collectionAssignment.MakeAssignment((IEnumerable)internalValue, ValueChanged);
+                        if (internalValue != null)
+                        {
+                            await collectionAssignment.MakeAssignment((IEnumerable)internalValue, ValueChanged);
+                        }
                     }
                     else
                     {
-                        await ValueChanged.InvokeAsync((T)internalValue);
+                        await ValueChanged.InvokeAsync(internalValue != null ? (T)internalValue : default(T)!);
                     }
                 }
 
@@ -1205,11 +1322,27 @@ namespace Radzen
 
                 await Change.InvokeAsync(internalValue);
             }
+
             StateHasChanged();
         }
 
+        /// <summary>
+        /// Handles keyboard activation for the select-all action.
+        /// </summary>
+        /// <param name="args">The <see cref="Microsoft.AspNetCore.Components.Web.KeyboardEventArgs"/> instance containing the event data.</param>
+        protected async Task OnSelectAllKeyDown(Microsoft.AspNetCore.Components.Web.KeyboardEventArgs args)
+        {
+            ArgumentNullException.ThrowIfNull(args);
+
+            var key = args.Code != null ? args.Code : args.Key;
+            if (key == "Enter" || key == "Space")
+            {
+                await SelectAll();
+            }
+        }
+
         /// <inheritdoc />
-        public override object GetValue()
+        public override object? GetValue()
         {
             return internalValue;
         }
@@ -1220,7 +1353,7 @@ namespace Radzen
             {
                 var value = GetItemOrValueFromProperty(item, ValueProperty);
 
-                if (!IsItemSelectedByValue(value))
+                if (value != null && !IsItemSelectedByValue(value))
                 {
                     selectedItems.Add(item);
                 }
@@ -1242,7 +1375,7 @@ namespace Radzen
         /// Selects the item from value.
         /// </summary>
         /// <param name="value">The value.</param>
-        protected virtual void SelectItemFromValue(object value)
+        protected virtual void SelectItemFromValue(object? value)
         {
             var view = LoadData.HasDelegate ? Data : View;
             if (value != null && view != null)
@@ -1289,7 +1422,7 @@ namespace Radzen
 
                                 if (typeof(EnumerableQuery).IsAssignableFrom(view.GetType()))
                                 {
-                                    item = view.OfType<object>().Where(i => object.Equals(GetItemOrValueFromProperty(i, ValueProperty), v)).FirstOrDefault();
+                                    item = view.OfType<object>().Where(i => object.Equals(GetItemOrValueFromProperty(i, ValueProperty), v)).FirstOrDefault()!;
                                 }
                                 else
                                 {
@@ -1302,7 +1435,7 @@ namespace Radzen
                                         }
                                     },
                                     LogicalFilterOperator.And,
-                                    FilterCaseSensitivity.Default).FirstOrDefault();
+                                    FilterCaseSensitivity.Default).FirstOrDefault()!;
                                 }
 
                                 if (!object.Equals(item, null) && !selectedItems.AsQueryable().Where(i => object.Equals(GetItemOrValueFromProperty(i, ValueProperty), v)).Any())
@@ -1327,7 +1460,7 @@ namespace Radzen
         /// <summary>
         /// For lists of objects, an IEqualityComparer to control how selected items are determined
         /// </summary>
-        [Parameter] public IEqualityComparer<object> ItemComparer { get; set; }
+        [Parameter] public IEqualityComparer<object>? ItemComparer { get; set; }
 
         internal bool IsItemSelectedByValue(object v)
         {
@@ -1350,6 +1483,8 @@ namespace Radzen
             base.Dispose();
 
             keys.Clear();
+
+            GC.SuppressFinalize(this);
         }
         
         private class DefaultCollectionAssignment
@@ -1360,42 +1495,55 @@ namespace Radzen
                 {
                     if (object.Equals(selectedItems, null))
                     {
-                        await valueChanged.InvokeAsync(default(T));
+                        await valueChanged.InvokeAsync(default(T)!);
                     }
                     else
                     {
-                        var list = (IList)Activator.CreateInstance(typeof(T));
-                        foreach (var i in (IEnumerable)selectedItems)
+                        var list = (IList?)Activator.CreateInstance<T>();
+                        if (list != null)
                         {
-                            list.Add(i);
+                            foreach (var i in (IEnumerable)selectedItems)
+                            {
+                                list.Add(i);
+                            }
+                            await valueChanged.InvokeAsync((T)(object)list);
+                        }
+                        else
+                        {
+                            await valueChanged.InvokeAsync(default(T)!);
                         }
-                        await valueChanged.InvokeAsync((T)(object)list);
                     }
                 }
                 else if (typeof(T).IsGenericType && typeof(ICollection<>).MakeGenericType(typeof(T).GetGenericArguments()[0]).IsAssignableFrom(typeof(T)))
                 {
                     if (object.Equals(selectedItems, null))
                     {
-                        await valueChanged.InvokeAsync(default(T));
+                        await valueChanged.InvokeAsync(default(T)!);
                     }
                     else
                     {
-
-                            var list = (IList)Activator.CreateInstance(typeof(List<>).MakeGenericType(typeof(T).GetGenericArguments()[0]));
+                        var list = (IList?)Activator.CreateInstance(typeof(List<>).MakeGenericType(typeof(T).GetGenericArguments()[0]));
+                        if (list != null)
+                        {
                             foreach (var i in (IEnumerable)selectedItems)
                             {
                                 list.Add(i);
                             }
                             await valueChanged.InvokeAsync((T)(object)list);
+                        }
+                        else
+                        {
+                            await valueChanged.InvokeAsync(default(T)!);
+                        }
                     }
                 }
                 else
                 {
-                    await valueChanged.InvokeAsync(object.Equals(selectedItems, null) ? default(T) : (T)selectedItems);
+                    await valueChanged.InvokeAsync(object.Equals(selectedItems, null) ? default(T)! : (T)selectedItems);
                 }
             }
 
-            public virtual T GetCleared()
+            public virtual T? GetCleared()
             {
                 return default(T);
             }
@@ -1405,9 +1553,9 @@ namespace Radzen
         {
             private readonly T originalCollection;
             private readonly bool canHandle;
-            private readonly System.Reflection.MethodInfo clearMethod;
-            private readonly System.Reflection.MethodInfo addMethod;
-            private readonly System.Reflection.MethodInfo removeMethod;
+            private readonly System.Reflection.MethodInfo? clearMethod;
+            private readonly System.Reflection.MethodInfo? addMethod;
+            private readonly System.Reflection.MethodInfo? removeMethod;
 
             public ReferenceGenericCollectionAssignment(T originalCollection)
             {
@@ -1434,34 +1582,34 @@ namespace Radzen
 
             public override async Task MakeAssignment(IEnumerable selectedItems, EventCallback<T> valueChanged)
             {
-                if (!canHandle)
+                if (!canHandle || originalCollection == null)
                 {
-                    // Fallback to default behavior when we can't handle the type
+                    // Fallback to default behavior when we can't handle the type or originalCollection is null
                     await base.MakeAssignment(selectedItems, valueChanged);
                     return;
                 }
 
                 var currentItems = selectedItems.Cast<object>().ToHashSet();
-                var existingItems = ((IEnumerable)originalCollection).Cast<object>().ToHashSet();
+                var existingItems = (originalCollection as IEnumerable)?.Cast<object>().ToHashSet() ?? new HashSet<object>();
                 foreach (var i in currentItems)
                 {
                     if (!existingItems.Contains(i))
-                        addMethod.Invoke(originalCollection, [i]);
+                        addMethod!.Invoke(originalCollection, [i]);
                 }
                 foreach (var i in existingItems)
                 {
                     if (!currentItems.Contains(i))
-                        removeMethod.Invoke(originalCollection, [i]);
+                        removeMethod!.Invoke(originalCollection, [i]);
                 }
 
                 await valueChanged.InvokeAsync(originalCollection);
             }
 
-            public override T GetCleared()
+            public override T? GetCleared()
             {
-                if (canHandle)
+                if (canHandle && originalCollection != null)
                 {
-                    clearMethod.Invoke(originalCollection, null);
+                    clearMethod!.Invoke(originalCollection, null);
                     return originalCollection;
                 }
                 return base.GetCleared();

Radzen.Blazor/DropDownBaseItemRenderEventArgs.cs

@@ -0,0 +1,32 @@
+using System.Collections.Generic;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about RadzenDropDown ItemRender event.
+/// </summary>
+public class DropDownBaseItemRenderEventArgs<TValue>
+{
+    /// <summary>
+    /// Gets the data item.
+    /// </summary>
+    public object? Item { get; internal set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether this item is visible.
+    /// </summary>
+    /// <value><c>true</c> if visible; otherwise, <c>false</c>.</value>
+    public bool Visible { get; set; } = true;
+
+    /// <summary>
+    /// Gets or sets a value indicating whether this item is disabled.
+    /// </summary>
+    /// <value><c>true</c> if disabled; otherwise, <c>false</c>.</value>
+    public bool Disabled { get; set; }
+
+    /// <summary>
+    /// Gets or sets the row HTML attributes.
+    /// </summary>
+    public IDictionary<string, object> Attributes { get; private set; } = new Dictionary<string, object>();
+}
+

Radzen.Blazor/DropDownItemRenderEventArgs.cs

@@ -0,0 +1,15 @@
+using Radzen.Blazor;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about RadzenDropDown ItemRender event.
+/// </summary>
+public class DropDownItemRenderEventArgs<TValue> : DropDownBaseItemRenderEventArgs<TValue>
+{
+    /// <summary>
+    /// Gets the DropDown.
+    /// </summary>
+    public RadzenDropDown<TValue>? DropDown { get; internal set; }
+}
+

Radzen.Blazor/DynamicExtensions.cs

@@ -9,8 +9,13 @@ namespace System.Linq.Dynamic.Core
     /// </summary>
     public static class DynamicExtensions
     {
-        static readonly Func<string, Type> typeLocator = type => AppDomain.CurrentDomain.GetAssemblies()
-            .SelectMany(a => a.GetTypes()).FirstOrDefault(t => t.FullName.Replace("+", ".") == type);
+        static readonly Func<string, Type?> typeLocator = type => AppDomain.CurrentDomain.GetAssemblies()
+            .SelectMany(a => a.GetTypes())
+            .FirstOrDefault(t =>
+            {
+                var fullName = t.FullName;
+                return fullName != null && fullName.Replace("+", ".", StringComparison.Ordinal) == type;
+            });
 
         /// <summary>
         /// Filters using the specified filter descriptors.
@@ -18,28 +23,30 @@ namespace System.Linq.Dynamic.Core
         public static IQueryable<T> Where<T>(
             this IQueryable<T> source,
             string predicate,
-            object[] parameters = null, object[] otherParameters = null)
+            object[]? parameters = null, object[]? otherParameters = null)
         {
+            ArgumentNullException.ThrowIfNull(source);
+
             try
             {
                 if (parameters != null && !string.IsNullOrEmpty(predicate))
                 {
                     predicate = Regex.Replace(predicate, @"@(\d+)", match =>
                     {
-                        int index = int.Parse(match.Groups[1].Value);
+                        int index = int.Parse(match.Groups[1].Value, System.Globalization.CultureInfo.InvariantCulture);
                         if (index >= parameters.Length)
                             throw new InvalidOperationException($"No parameter provided for {match.Value}");
 
-                        return ExpressionSerializer.FormatValue(parameters[index]);
+                        return ExpressionSerializer.FormatValue(parameters[index]) ?? string.Empty;
                     });
                 }
 
-                predicate = (predicate == "true" ? "" : predicate)
-                    .Replace("DateTime(", "DateTime.Parse(")
-                    .Replace("DateTimeOffset(", "DateTimeOffset.Parse(")
-                    .Replace("DateOnly(", "DateOnly.Parse(")
-                    .Replace("Guid(", "Guid.Parse(")
-                    .Replace(" = ", " == ");
+                predicate = (predicate == "true" ? "" : predicate ?? string.Empty)
+                    .Replace("DateTime(", "DateTime.Parse(", StringComparison.Ordinal)
+                    .Replace("DateTimeOffset(", "DateTimeOffset.Parse(", StringComparison.Ordinal)
+                    .Replace("DateOnly(", "DateOnly.Parse(", StringComparison.Ordinal)
+                    .Replace("Guid(", "Guid.Parse(", StringComparison.Ordinal)
+                    .Replace(" = ", " == ", StringComparison.Ordinal);
 
                 return !string.IsNullOrEmpty(predicate) ?
                     source.Where(ExpressionParser.ParsePredicate<T>(predicate, typeLocator)) : source;
@@ -56,8 +63,10 @@ namespace System.Linq.Dynamic.Core
         public static IOrderedQueryable<T> OrderBy<T>(
             this IQueryable<T> source,
             string selector,
-            object[] parameters = null)
+            object[]? parameters = null)
         {
+            ArgumentNullException.ThrowIfNull(source);
+
             try
             {
                 return QueryableExtension.OrderBy(source, selector);
@@ -71,8 +80,10 @@ namespace System.Linq.Dynamic.Core
         /// <summary>
         /// Projects each element of a sequence into a collection of property values.
         /// </summary>
-        public static IQueryable Select<T>(this IQueryable<T> source, string selector, object[] parameters = null)
+        public static IQueryable Select<T>(this IQueryable<T> source, string selector, object[]? parameters = null)
         {
+            ArgumentNullException.ThrowIfNull(source);
+
             if (source.ElementType == typeof(object))
             {
                 var elementType = source.ElementType;
@@ -95,8 +106,10 @@ namespace System.Linq.Dynamic.Core
         /// <summary>
         /// Projects each element of a sequence into a collection of property values.
         /// </summary>
-        public static IQueryable Select(this IQueryable source, string selector, object[] parameters = null)
+        public static IQueryable Select(this IQueryable source, string selector, object[]? parameters = null)
         {
+            ArgumentNullException.ThrowIfNull(source);
+            ArgumentNullException.ThrowIfNull(selector);
             return source.Select(selector, expression => ExpressionParser.ParseLambda(expression, source.ElementType));
         }
 
@@ -109,18 +122,27 @@ namespace System.Linq.Dynamic.Core
                     return source;
                 }
 
-                if (!selector.Contains("=>"))
+                if (!selector.Contains("=>", StringComparison.Ordinal))
                 {
                     var properties = selector
-                        .Replace("new (", "").Replace(")", "").Replace("new {", "").Replace("}", "").Trim()
+                        .Replace("new (", "", StringComparison.Ordinal).Replace(")", "", StringComparison.Ordinal).Replace("new {", "", StringComparison.Ordinal).Replace("}", "", StringComparison.Ordinal).Trim()
                         .Split(",", StringSplitOptions.RemoveEmptyEntries);
 
                     selector = string.Join(", ", properties
-                        .Select(s => (s.Contains(" as ") ? s.Split(" as ").LastOrDefault().Trim().Replace(".", "_") : s.Trim().Replace(".", "_")) +
-                            " = " + $"it.{s.Split(" as ").FirstOrDefault().Replace(".", "?.").Trim()}"));
+                        .Select(s =>
+                        {
+                            var parts = s.Split(" as ", StringSplitOptions.RemoveEmptyEntries);
+                            var sourcePart = (parts.FirstOrDefault() ?? s).Trim();
+                            var targetPart = (parts.Length > 1 ? parts.Last() : sourcePart).Trim();
+
+                            var safeTarget = targetPart.Replace(".", "_", StringComparison.Ordinal);
+                            var safeSource = sourcePart.Replace(".", "?.", StringComparison.Ordinal);
+
+                            return $"{safeTarget} = it.{safeSource}";
+                        }));
                 }
 
-                var lambda = lambdaCreator(selector.Contains("=>") ? selector : $"it => new {{ {selector} }}");
+                var lambda = lambdaCreator(selector.Contains("=>", StringComparison.Ordinal) ? selector : $"it => new {{ {selector} }}");
 
                 return source.Provider.CreateQuery(Expression.Call(typeof(Queryable), nameof(Queryable.Select),
                           [source.ElementType, lambda.Body.Type], source.Expression, Expression.Quote(lambda)));

Radzen.Blazor/DynamicTypeFactory.cs

@@ -39,7 +39,7 @@ static class DynamicTypeFactory
                       "set_" + propertyNames[i],
                       MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig,
                       null,
-                      [propertyTypes[i]]);
+                      new[] { propertyTypes[i] });
 
             var setterIl = setterMethod.GetILGenerator();
             setterIl.Emit(OpCodes.Ldarg_0);
@@ -51,6 +51,10 @@ static class DynamicTypeFactory
         }
 
         var dynamicType = typeBuilder.CreateType();
+        if (dynamicType == null)
+        {
+            throw new InvalidOperationException("Failed to create dynamic type.");
+        }
         return dynamicType;
     }
 }

Radzen.Blazor/ExpressionLexer.cs

@@ -1,150 +1,14 @@
 using System;
 using System.Collections.Generic;
-using System.ComponentModel;
 using System.Globalization;
-using System.Linq.Expressions;
 using System.Text;
 
 namespace Radzen;
 
-class Token
-{
-    public TokenType Type { get; set; }
-    public string Value { get; set; } = string.Empty;
-    public ValueKind ValueKind { get; set; } = ValueKind.None;
-    public int IntValue { get; internal set; }
-    public uint UintValue { get; internal set; }
-    public long LongValue { get; internal set; }
-    public ulong UlongValue { get; internal set; }
-    public decimal DecimalValue { get; internal set; }
-    public float FloatValue { get; internal set; }
-    public double DoubleValue { get; internal set; }
-
-    public Token(TokenType type)
-    {
-        Type = type;
-    }
-
-    public Token(TokenType type, string value)
-    {
-        Type = type;
-        Value = value;
-    }
-
-    public ConstantExpression ToConstantExpression()
-    {
-        return ValueKind switch
-        {
-            ValueKind.Null => Expression.Constant(null),
-            ValueKind.String => Expression.Constant(Value),
-            ValueKind.Character => Expression.Constant(Value[0]),
-            ValueKind.Int => Expression.Constant(IntValue),
-            ValueKind.UInt => Expression.Constant(UintValue),
-            ValueKind.Long => Expression.Constant(LongValue),
-            ValueKind.ULong => Expression.Constant(UlongValue),
-            ValueKind.Float => Expression.Constant(FloatValue),
-            ValueKind.Double => Expression.Constant(DoubleValue),
-            ValueKind.Decimal => Expression.Constant(DecimalValue),
-            ValueKind.True => Expression.Constant(true),
-            ValueKind.False => Expression.Constant(false),
-            _ => throw new InvalidOperationException($"Unsupported value kind: {ValueKind}")
-        };
-    }
-}
-
-enum ValueKind
-{
-    None,
-    String,
-    Int,
-    Float,
-    Double,
-    Decimal,
-    Character,
-    Null,
-    True,
-    False,
-    Long,
-    UInt,
-    ULong,
-}
-
-
-enum TokenType
-{
-    None,
-    Identifier,
-    EqualsEquals,
-    NotEquals,
-    EqualsGreaterThan,
-    StringLiteral,
-    NumericLiteral,
-    Dot,
-    OpenParen,
-    CloseParen,
-    Comma,
-    AmpersandAmpersand,
-    Ampersand,
-    BarBar,
-    Bar,
-    GreaterThan,
-    LessThan,
-    LessThanOrEqual,
-    GreaterThanOrEqual,
-    Plus,
-    Minus,
-    Star,
-    Slash,
-    CharacterLiteral,
-    QuestionMark,
-    QuestionMarkQuestionMark,
-    Colon,
-    QuestionDot,
-    New,
-    NullLiteral,
-    TrueLiteral,
-    FalseLiteral,
-    OpenBracket,
-    CloseBracket,
-    OpenBrace,
-    CloseBrace,
-    ExclamationMark,
-    Equals,
-    Caret,
-    GreaterThanGreaterThan,
-    LessThanLessThan,
-}
-
-static class TokenTypeExtensions
-{
-    public static ExpressionType ToExpressionType(this TokenType tokenType)
-    {
-        return tokenType switch
-        {
-            TokenType.EqualsEquals => ExpressionType.Equal,
-            TokenType.NotEquals => ExpressionType.NotEqual,
-            TokenType.EqualsGreaterThan => ExpressionType.GreaterThanOrEqual,
-            TokenType.AmpersandAmpersand => ExpressionType.AndAlso,
-            TokenType.Ampersand => ExpressionType.And,
-            TokenType.BarBar => ExpressionType.OrElse,
-            TokenType.Bar => ExpressionType.Or,
-            TokenType.GreaterThan => ExpressionType.GreaterThan,
-            TokenType.LessThan => ExpressionType.LessThan,
-            TokenType.LessThanOrEqual => ExpressionType.LessThanOrEqual,
-            TokenType.GreaterThanOrEqual => ExpressionType.GreaterThanOrEqual,
-            TokenType.Plus => ExpressionType.Add,
-            TokenType.Minus => ExpressionType.Subtract,
-            TokenType.Star => ExpressionType.Multiply,
-            TokenType.Slash => ExpressionType.Divide,
-            TokenType.Caret => ExpressionType.ExclusiveOr,
-            TokenType.GreaterThanGreaterThan => ExpressionType.RightShift,
-            TokenType.LessThanLessThan => ExpressionType.LeftShift,
-            _ => throw new InvalidOperationException($"Unsupported token type: {tokenType}")
-        };
-    }
-}
-
-class ExpressionLexer(string expression)
+/// <summary>
+/// Lexer for parsing expressions into tokens.
+/// </summary>
+internal class ExpressionLexer(string expression)
 {
     private int position;
 
@@ -163,7 +27,7 @@ class ExpressionLexer(string expression)
         position += count;
     }
 
-    bool TryAdvance(char expected)
+    private bool TryAdvance(char expected)
     {
         if (Peek(1) == expected)
         {
@@ -182,6 +46,11 @@ class ExpressionLexer(string expression)
         }
     }
 
+    /// <summary>
+    /// Scans the expression and returns a list of tokens.
+    /// </summary>
+    /// <param name="expression">The expression to scan.</param>
+    /// <returns>A list of tokens.</returns>
     public static List<Token> Scan(string expression)
     {
         var lexer = new ExpressionLexer(expression);
@@ -189,6 +58,10 @@ class ExpressionLexer(string expression)
         return [.. lexer.Scan()];
     }
 
+    /// <summary>
+    /// Scans the expression and returns an enumerable of tokens.
+    /// </summary>
+    /// <returns>An enumerable of tokens.</returns>
     public IEnumerable<Token> Scan()
     {
         while (position < expression.Length)
@@ -418,7 +291,7 @@ class ExpressionLexer(string expression)
             var digit = Peek();
 
             int digitValue;
-            
+
             if (digit >= '0' && digit <= '9')
             {
                 digitValue = digit - '0';
@@ -645,7 +518,7 @@ class ExpressionLexer(string expression)
                         break;
                     case 'D':
                     case 'd':
-                    hasDSuffix = true;
+                        hasDSuffix = true;
                         Advance(1);
                         break;
                     case 'M':
@@ -754,7 +627,7 @@ class ExpressionLexer(string expression)
                     value.ValueKind = ValueKind.ULong;
                     value.UlongValue = val;
                 }
-            break;
+                break;
         }
 
         return value;
@@ -870,4 +743,4 @@ class ExpressionLexer(string expression)
             }
         }
     }
-}
+}

Radzen.Blazor/ExpressionParser.cs

@@ -28,7 +28,7 @@ public class ExpressionParser
     /// </summary>
     public static Expression<Func<T, TResult>> ParseLambda<T, TResult>(string expression, Func<string, Type?>? typeResolver = null)
     {
-        var lambda = ParseLambda(expression, typeof(T), typeResolver);
+        var lambda = ParseLambda<T>(expression, typeResolver);
 
         return Expression.Lambda<Func<T, TResult>>(lambda.Body, lambda.Parameters[0]);
     }
@@ -52,7 +52,7 @@ public class ExpressionParser
     }
 
     private readonly List<Token> tokens;
-    private int position = 0;
+    private int position;
     private readonly Func<string, Type?>? typeResolver;
     private readonly Stack<ParameterExpression> parameterStack = new();
 
@@ -414,6 +414,11 @@ public class ExpressionParser
                 return ParseStaticMemberAccess(type, parameter);
             }
 
+            if (TryParseQualifiedType(out var qualifiedType))
+            {
+                return ParseStaticMemberAccess(qualifiedType, parameter);
+            }
+
             if (Peek(1).Type == TokenType.OpenParen)
             {
                 Advance(1);
@@ -542,19 +547,10 @@ public class ExpressionParser
                 else
                 {
                     Type? elementType = null;
-                    var nullable = false;
 
-                    if (token.Type == TokenType.Identifier)
+                    if (TryParseQualifiedArrayType(out var parsedElementType))
                     {
-                        var typeName = token.Value;
-                        elementType = GetWellKnownType(typeName);
-                        Advance(1);
-
-                        if (Peek().Type == TokenType.QuestionMark)
-                        {
-                            nullable = true;
-                            Advance(1);
-                        }
+                        elementType = parsedElementType;
                     }
 
                     Expect(TokenType.OpenBracket);
@@ -585,11 +581,6 @@ public class ExpressionParser
                         elementType = elements.Count > 0 ? elements[0].Type : typeof(object);
                     }
 
-                    if (nullable)
-                    {
-                        elementType = typeof(Nullable<>).MakeGenericType(elementType);
-                    }
-
                     return Expression.NewArrayInit(elementType, elements.Select(e => ConvertIfNeeded(e, elementType)));
                 }
             default:
@@ -653,7 +644,7 @@ public class ExpressionParser
         {
             var name = typeName.ToString();
 
-            var type = GetWellKnownType(name) ?? typeResolver?.Invoke(name) ?? throw new InvalidOperationException($"Could not resolve type: {typeName}");
+            var type = ResolveType(name) ?? throw new InvalidOperationException($"Could not resolve type: {typeName}");
 
             if (nullable && type.IsValueType)
             {
@@ -729,6 +720,156 @@ public class ExpressionParser
         return Expression.Call(null, method, arguments);
     }
 
+    /// <summary>
+    /// Tries to parse a qualified type name (e.g. System.DateTime or System.DateTime?) and returns the resolved type.
+    /// Advances position past the type name. The next token will be . for member access or [ for array.
+    /// Uses backtracking to find the longest resolvable type prefix (e.g. System.DateTime in System.DateTime.SpecifyKind).
+    /// </summary>
+    private bool TryParseQualifiedType(out Type type)
+    {
+        type = null!;
+
+        var token = Peek();
+        if (token.Type != TokenType.Identifier)
+        {
+            return false;
+        }
+
+        var startPosition = position;
+        var parts = new List<string> { token.Value };
+        Advance(1);
+
+        while (Peek().Type == TokenType.Dot)
+        {
+            Advance(1);
+            token = Peek();
+            if (token.Type != TokenType.Identifier)
+            {
+                return false;
+            }
+            parts.Add(token.Value);
+            Advance(1);
+        }
+
+        var nullable = false;
+        if (Peek().Type == TokenType.QuestionMark)
+        {
+            nullable = true;
+            Advance(1);
+        }
+
+        for (var i = parts.Count; i >= 1; i--)
+        {
+            var typeName = string.Join(".", parts.Take(i));
+            var resolvedType = ResolveType(typeName);
+            if (resolvedType != null)
+            {
+                if (nullable && resolvedType.IsValueType)
+                {
+                    resolvedType = typeof(Nullable<>).MakeGenericType(resolvedType);
+                }
+
+                position = startPosition;
+                var tokensToConsume = (i * 2) - 1 + (nullable ? 1 : 0);
+                for (var t = 0; t < tokensToConsume; t++)
+                {
+                    Advance(1);
+                }
+
+                type = resolvedType;
+                return true;
+            }
+        }
+
+        position = startPosition;
+        return false;
+    }
+
+    /// <summary>
+    /// Tries to parse a qualified array element type (e.g. System.DateTime? or DateTime) before [].
+    /// Advances position past the type name to the [. Returns the element type for the array.
+    /// </summary>
+    private bool TryParseQualifiedArrayType(out Type? elementType)
+    {
+        elementType = null;
+
+        var token = Peek();
+        if (token.Type != TokenType.Identifier)
+        {
+            return false;
+        }
+
+        var startPosition = position;
+        var parts = new List<string> { token.Value };
+        Advance(1);
+
+        while (Peek().Type == TokenType.Dot)
+        {
+            Advance(1);
+            token = Peek();
+            if (token.Type != TokenType.Identifier)
+            {
+                position = startPosition;
+                return false;
+            }
+            parts.Add(token.Value);
+            Advance(1);
+        }
+
+        var nullable = false;
+        if (Peek().Type == TokenType.QuestionMark)
+        {
+            nullable = true;
+            Advance(1);
+        }
+
+        if (Peek().Type != TokenType.OpenBracket)
+        {
+            position = startPosition;
+            return false;
+        }
+
+        for (var i = parts.Count; i >= 1; i--)
+        {
+            var typeName = string.Join(".", parts.Take(i));
+            var resolvedType = ResolveType(typeName);
+            if (resolvedType != null)
+            {
+                if (nullable && resolvedType.IsValueType)
+                {
+                    resolvedType = typeof(Nullable<>).MakeGenericType(resolvedType);
+                }
+                elementType = resolvedType;
+                return true;
+            }
+        }
+
+        position = startPosition;
+        return false;
+    }
+
+    /// <summary>
+    /// Resolves a type name using well-known types, the optional type resolver, or by searching loaded assemblies.
+    /// This allows any type from loaded assemblies to be resolved without hardcoding.
+    /// </summary>
+    private Type? ResolveType(string typeName)
+    {
+        return GetWellKnownType(typeName)
+            ?? typeResolver?.Invoke(typeName)
+            ?? ResolveTypeFromAssemblies(typeName);
+    }
+
+    private static Type? ResolveTypeFromAssemblies(string typeName)
+    {
+        return AppDomain.CurrentDomain.GetAssemblies()
+            .SelectMany(a => a.GetTypes())
+            .FirstOrDefault(t =>
+            {
+                var fullName = t.FullName;
+                return fullName != null && fullName.Replace("+", ".", StringComparison.Ordinal) == typeName;
+            });
+    }
+
     private static Type? GetWellKnownType(string typeName)
     {
         return typeName switch

Radzen.Blazor/ExpressionSerializer.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Globalization;
@@ -30,6 +30,7 @@ public class ExpressionSerializer : ExpressionVisitor
     /// <inheritdoc/>
     protected override Expression VisitLambda<T>(Expression<T> node)
     {
+        ArgumentNullException.ThrowIfNull(node);
         if (node.Parameters.Count > 1)
         {
             _sb.Append("(");
@@ -52,6 +53,7 @@ public class ExpressionSerializer : ExpressionVisitor
     /// <inheritdoc/>
     protected override Expression VisitParameter(ParameterExpression node)
     {
+        ArgumentNullException.ThrowIfNull(node);
         _sb.Append(node.Name);
         return node;
     }
@@ -59,10 +61,11 @@ public class ExpressionSerializer : ExpressionVisitor
     /// <inheritdoc/>
     protected override Expression VisitMember(MemberExpression node)
     {
+        ArgumentNullException.ThrowIfNull(node);
         if (node.Expression != null)
         {
             Visit(node.Expression);
-            _sb.Append($".{node.Member.Name}");
+            _sb.Append(CultureInfo.InvariantCulture, $".{node.Member.Name}");
         }
         else
         {
@@ -74,14 +77,15 @@ public class ExpressionSerializer : ExpressionVisitor
     /// <inheritdoc/>
     protected override Expression VisitMethodCall(MethodCallExpression node)
     {
+        ArgumentNullException.ThrowIfNull(node);
         if (node.Method.IsStatic && node.Arguments.Count > 0 &&
-            (node.Method.DeclaringType == typeof(Enumerable) || 
+            (node.Method.DeclaringType == typeof(Enumerable) ||
                 node.Method.DeclaringType == typeof(Queryable)))
         {
             Visit(node.Arguments[0]);
-            _sb.Append($".{node.Method.Name}(");
+            _sb.Append(CultureInfo.InvariantCulture, $".{node.Method.Name}(");
 
-            for (int i = 1; i < node.Arguments.Count; i++) 
+            for (int i = 1; i < node.Arguments.Count; i++)
             {
                 if (i > 1) _sb.Append(", ");
 
@@ -99,7 +103,7 @@ public class ExpressionSerializer : ExpressionVisitor
         }
         else if (node.Method.IsStatic)
         {
-            _sb.Append($"{node.Method.DeclaringType.Name}.{node.Method.Name}(");
+            _sb.Append(CultureInfo.InvariantCulture, $"{node.Method.DeclaringType?.Name}.{node.Method.Name}(");
 
             for (int i = 0; i < node.Arguments.Count; i++)
             {
@@ -114,11 +118,11 @@ public class ExpressionSerializer : ExpressionVisitor
             if (node.Object != null)
             {
                 Visit(node.Object);
-                _sb.Append($".{node.Method.Name}(");
+                _sb.Append(CultureInfo.InvariantCulture, $".{node.Method.Name}(");
             }
             else
             {
-                _sb.Append($"{node.Method.Name}(");
+                _sb.Append(CultureInfo.InvariantCulture, $"{node.Method.Name}(");
             }
 
             for (int i = 0; i < node.Arguments.Count; i++)
@@ -136,17 +140,18 @@ public class ExpressionSerializer : ExpressionVisitor
     /// <inheritdoc/>
     protected override Expression VisitUnary(UnaryExpression node)
     {
+        ArgumentNullException.ThrowIfNull(node);
         if (node.NodeType == ExpressionType.Not)
         {
             _sb.Append("(!(");
             Visit(node.Operand);
             _sb.Append("))");
         }
-        else if (node.NodeType == ExpressionType.Convert) 
+        else if (node.NodeType == ExpressionType.Convert)
         {
             if (node.Operand is IndexExpression indexExpr)
             {
-                _sb.Append($"({node.Type.DisplayName(true).Replace("+",".")})");
+                _sb.Append(CultureInfo.InvariantCulture, $"({node.Type.DisplayName(true).Replace("+", ".", StringComparison.Ordinal)})");
 
                 Visit(indexExpr.Object);
 
@@ -175,20 +180,18 @@ public class ExpressionSerializer : ExpressionVisitor
     /// <inheritdoc/>
     protected override Expression VisitConstant(ConstantExpression node)
     {
+        ArgumentNullException.ThrowIfNull(node);
         _sb.Append(FormatValue(node.Value));
         return node;
     }
 
-    internal static string FormatValue(object value)
+    internal static string? FormatValue(object? value)
     {
-        if (value == null)
-            return "null";
-
         return value switch
         {
-            string s when s == string.Empty => @"""""",
+            string s when s.Length == 0 => @"""""",
             null => "null",
-            string s => @$"""{s.Replace("\"", "\\\"")}""",
+            string s => @$"""{s.Replace("\"", "\\\"", StringComparison.Ordinal)}""",
             char c => $"'{c}'",
             bool b => b.ToString().ToLowerInvariant(),
             DateTime dt => FormatDateTime(dt),
@@ -198,7 +201,7 @@ public class ExpressionSerializer : ExpressionVisitor
             Guid guid => $"Guid.Parse(\"{guid.ToString("D", CultureInfo.InvariantCulture)}\")",
             IEnumerable enumerable when value is not string => FormatEnumerable(enumerable),
             _ => value.GetType().IsEnum
-                ? $"({value.GetType().FullName.Replace("+", ".")})" + Convert.ChangeType(value, Enum.GetUnderlyingType(value.GetType()), CultureInfo.InvariantCulture).ToString()
+                ? $"({value.GetType()?.FullName?.Replace("+", ".", StringComparison.Ordinal)})" + Convert.ChangeType(value, Enum.GetUnderlyingType(value.GetType()), CultureInfo.InvariantCulture).ToString()
                 : Convert.ToString(value, CultureInfo.InvariantCulture)
         };
     }
@@ -214,14 +217,15 @@ public class ExpressionSerializer : ExpressionVisitor
     private static string FormatEnumerable(IEnumerable enumerable)
     {
         var arrayType = enumerable.AsQueryable().ElementType;
-        
+
         var items = enumerable.Cast<object>().Select(FormatValue);
-        return $"new {(Nullable.GetUnderlyingType(arrayType) != null ? arrayType.DisplayName(true).Replace("+", ".") : "")}[] {{ {string.Join(", ", items)} }}";
+        return $"new {(Nullable.GetUnderlyingType(arrayType) != null ? arrayType.DisplayName(true).Replace("+", ".", StringComparison.Ordinal) : "")}[] {{ {string.Join(", ", items)} }}";
     }
 
     /// <inheritdoc/>
     protected override Expression VisitNewArray(NewArrayExpression node)
     {
+        ArgumentNullException.ThrowIfNull(node);
         bool needsParentheses = node.NodeType == ExpressionType.NewArrayInit &&
                                 (node.Expressions.Count > 1 || node.Expressions[0].NodeType != ExpressionType.Constant);
 
@@ -245,9 +249,10 @@ public class ExpressionSerializer : ExpressionVisitor
     /// <inheritdoc/>
     protected override Expression VisitBinary(BinaryExpression node)
     {
+        ArgumentNullException.ThrowIfNull(node);
         _sb.Append("(");
         Visit(node.Left);
-        _sb.Append($" {GetOperator(node.NodeType)} ");
+        _sb.Append(CultureInfo.InvariantCulture, $" {GetOperator(node.NodeType)} ");
         Visit(node.Right);
         _sb.Append(")");
         return node;
@@ -256,6 +261,7 @@ public class ExpressionSerializer : ExpressionVisitor
     /// <inheritdoc/>
     protected override Expression VisitConditional(ConditionalExpression node)
     {
+        ArgumentNullException.ThrowIfNull(node);
         _sb.Append("(");
         Visit(node.Test);
         _sb.Append(" ? ");
@@ -266,6 +272,21 @@ public class ExpressionSerializer : ExpressionVisitor
         return node;
     }
 
+    /// <inheritdoc/>
+    protected override Expression VisitDefault(DefaultExpression node)
+    {
+        ArgumentNullException.ThrowIfNull(node);
+        if (!node.Type.IsValueType || Nullable.GetUnderlyingType(node.Type) != null)
+        {
+            _sb.Append("null");
+        }
+        else
+        {
+            _sb.Append(CultureInfo.InvariantCulture, $"default({node.Type.DisplayName(true).Replace("+", ".", StringComparison.Ordinal)})");
+        }
+        return node;
+    }
+
     /// <summary>
     /// Maps an ExpressionType to its corresponding C# operator.
     /// </summary>
@@ -290,7 +311,7 @@ public class ExpressionSerializer : ExpressionVisitor
             ExpressionType.Coalesce => "??",
             _ => throw new NotSupportedException($"Unsupported operator: {type}")
         };
-    }  
+    }
 }
 
 /// <summary>
@@ -333,6 +354,7 @@ public static class SharedTypeExtensions
     /// <returns>A string representing the type name.</returns>
     public static string DisplayName(this Type type, bool fullName = true, bool compilable = false)
     {
+        ArgumentNullException.ThrowIfNull(type);
         var stringBuilder = new StringBuilder();
         ProcessType(stringBuilder, type, fullName, compilable);
         return stringBuilder.ToString();
@@ -443,7 +465,7 @@ public static class SharedTypeExtensions
             }
         }
 
-        var genericPartIndex = type.Name.IndexOf('`');
+        var genericPartIndex = type.Name.IndexOf('`', StringComparison.Ordinal);
         if (genericPartIndex <= 0)
         {
             builder.Append(type.Name);

Radzen.Blazor/Extensions.cs

@@ -2,6 +2,7 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
+using System.Globalization;
 using System.Linq;
 using System.Reflection;
 using System.Reflection.Emit;
@@ -18,8 +19,9 @@ namespace Radzen.Blazor
         /// <summary>
         /// Gets enum description.
         /// </summary>
-        public static string GetDisplayDescription(this Enum enumValue, Func<string, string> translationFunction = null)
+        public static string GetDisplayDescription(this Enum enumValue, Func<string, string>? translationFunction = null)
         {
+            ArgumentNullException.ThrowIfNull(enumValue);
             var enumValueAsString = enumValue.ToString();
             var val = enumValue.GetType().GetMember(enumValueAsString).FirstOrDefault();
             var enumVal = val?.GetCustomAttribute<DisplayAttribute>()?.GetDescription() ?? enumValueAsString;
@@ -33,10 +35,12 @@ namespace Radzen.Blazor
         /// <summary>
         /// Converts Enum to IEnumerable of Value/Text.
         /// </summary>
-        public static IEnumerable<object> EnumAsKeyValuePair(Type enumType, Func<string, string> translationFunction = null)
+        public static IEnumerable<object> EnumAsKeyValuePair(Type enumType, Func<string, string>? translationFunction = null)
         {
+            ArgumentNullException.ThrowIfNull(enumType);
+
             Type underlyingType = Enum.GetUnderlyingType(enumType);
-            return Enum.GetValues(enumType).Cast<Enum>().Distinct().Select(val => new { Value = Convert.ChangeType(val, underlyingType), Text = val.GetDisplayDescription(translationFunction) });
+            return Enum.GetValues(enumType).Cast<Enum>().Distinct().Select(val => new { Value = Convert.ChangeType(val, underlyingType, CultureInfo.InvariantCulture), Text = val.GetDisplayDescription(translationFunction) });
         }
 
         /// <summary>
@@ -67,7 +71,7 @@ namespace Radzen.Blazor
             var value = typeValue.ToString();
             value = Regex.Replace(value, "([^A-Z])([A-Z])", "$1-$2");
             return Regex.Replace(value, "([A-Z]+)([A-Z][^A-Z$])", "$1-$2")
-                .Trim().ToLower();
+                .Trim().ToLowerInvariant();
         }
     }
 }

Radzen.Blazor/FabMenuDirection.cs

@@ -0,0 +1,38 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the direction in which a RadzenFabMenu expands its items.
+/// </summary>
+public enum FabMenuDirection
+{
+    /// <summary>
+    /// The menu items expand upward from the FAB button.
+    /// </summary>
+    Top,
+
+    /// <summary>
+    /// The menu items expand downward from the FAB button.
+    /// </summary>
+    Bottom,
+
+    /// <summary>
+    /// The menu items expand to the left of the FAB button.
+    /// </summary>
+    Left,
+
+    /// <summary>
+    /// The menu items expand to the right of the FAB button.
+    /// </summary>
+    Right,
+
+    /// <summary>
+    /// The menu items expand to the start of the FAB button.
+    /// </summary>
+    Start,
+
+    /// <summary>
+    /// The menu items expand to the end of the FAB button.
+    /// </summary>
+    End
+}
+

Radzen.Blazor/FileInfo.cs

@@ -0,0 +1,106 @@
+using System;
+using System.Threading;
+using Microsoft.AspNetCore.Components.Forms;
+
+namespace Radzen;
+
+/// <summary>
+/// Represents a file which the user selects for upload via <see cref="Radzen.Blazor.RadzenUpload" />.
+/// </summary>
+public class FileInfo : IBrowserFile
+{
+    /// <summary>
+    /// Creates FileInfo.
+    /// </summary>
+    public FileInfo()
+    {
+        //
+    }
+
+    private IBrowserFile? source;
+
+    /// <summary>
+    /// Creates FileInfo with IBrowserFile as source.
+    /// </summary>
+    /// <param name="source">The source browser file.</param>
+    public FileInfo(IBrowserFile source)
+    {
+        this.source = source;
+    }
+
+    private string? name;
+    private DateTimeOffset? lastModified;
+    private string? contentType;
+
+    /// <summary>
+    /// Gets the name of the selected file.
+    /// </summary>
+    public string Name
+    {
+        get
+        {
+                return name ?? source?.Name ?? string.Empty;
+        }
+        set
+        {
+            name = value;
+        }
+    }
+
+    private long size;
+
+    /// <summary>
+    /// Gets the size (in bytes) of the selected file.
+    /// </summary>
+    public long Size
+    {
+        get
+        {
+            return size != default(long) ? size : source != null ? source.Size : 0;
+        }
+        set
+        {
+            size = value;
+        }
+    }
+
+    /// <summary>
+    /// Gets the IBrowserFile source.
+    /// </summary>
+    public IBrowserFile? Source => source;
+
+    /// <summary>
+    /// Gets the LastModified.
+    /// </summary>
+    public DateTimeOffset LastModified
+    {
+        get => lastModified ?? source?.LastModified ?? default;
+        set => lastModified = value;
+    }
+
+    /// <summary>
+    /// Gets the ContentType.
+    /// </summary>
+    public string ContentType
+    {
+        get => contentType ?? source?.ContentType ?? string.Empty;
+        set => contentType = value;
+    }
+
+    /// <summary>
+    /// Open read stream.
+    /// </summary>
+    /// <param name="maxAllowedSize">The maximum allowed size.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The stream.</returns>
+    public System.IO.Stream OpenReadStream(long maxAllowedSize = 512000, CancellationToken cancellationToken = default)
+    {
+        if (source == null)
+        {
+            throw new InvalidOperationException("No underlying browser file is associated with this FileInfo instance.");
+        }
+
+        return source.OpenReadStream(maxAllowedSize, cancellationToken);
+    }
+}
+

Radzen.Blazor/FilterCaseSensitivity.cs

@@ -0,0 +1,18 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the filter case sensitivity of a component.
+/// </summary>
+public enum FilterCaseSensitivity
+{
+    /// <summary>
+    /// Relies on the underlying provider (LINQ to Objects, Entity Framework etc.) to handle case sensitivity. LINQ to Objects is case sensitive. Entity Framework relies on the database collection settings.
+    /// </summary>
+    Default,
+
+    /// <summary>
+    /// Filters are case insensitive regardless of the underlying provider.
+    /// </summary>
+    CaseInsensitive
+}
+

Radzen.Blazor/FilterDescriptor.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Text.Json.Serialization;
+
+namespace Radzen;
+
+/// <summary>
+/// Represents a filter in a component that supports filtering.
+/// </summary>
+public class FilterDescriptor
+{
+    /// <summary>
+    /// Gets or sets the name of the filtered property.
+    /// </summary>
+    /// <value>The property.</value>
+    public string? Property { get; set; }
+
+    /// <summary>
+    /// Gets or sets the property type.
+    /// </summary>
+    /// <value>The property type.</value>
+    [JsonIgnore]
+    public Type? Type { get; set; }
+
+    /// <summary>
+    /// Gets or sets the name of the filtered property.
+    /// </summary>
+    /// <value>The property.</value>
+    public string? FilterProperty { get; set; }
+
+    /// <summary>
+    /// Gets or sets the value to filter by.
+    /// </summary>
+    /// <value>The filter value.</value>
+    public object? FilterValue { get; set; }
+
+    /// <summary>
+    /// Gets or sets the operator which will compare the property value with <see cref="FilterValue" />.
+    /// </summary>
+    /// <value>The filter operator.</value>
+    public FilterOperator FilterOperator { get; set; }
+
+    /// <summary>
+    /// Gets or sets a second value to filter by.
+    /// </summary>
+    /// <value>The second filter value.</value>
+    public object? SecondFilterValue { get; set; }
+
+    /// <summary>
+    /// Gets or sets the operator which will compare the property value with <see cref="SecondFilterValue" />.
+    /// </summary>
+    /// <value>The second filter operator.</value>
+    public FilterOperator SecondFilterOperator { get; set; }
+
+    /// <summary>
+    /// Gets or sets the logic used to combine the outcome of filtering by <see cref="FilterValue" /> and <see cref="SecondFilterValue" />.
+    /// </summary>
+    /// <value>The logical filter operator.</value>
+    public LogicalFilterOperator LogicalFilterOperator { get; set; }
+
+    /// <summary>
+    /// Gets or sets the mode that determines whether the filter applies to any or all items in a collection.
+    /// </summary>
+    /// <value>
+    /// A <see cref="CollectionFilterMode"/> value indicating whether the filter is satisfied by any or all items.
+    /// </value>
+    public CollectionFilterMode CollectionFilterMode { get; set; }
+}
+

Radzen.Blazor/FilterMode.cs

@@ -0,0 +1,28 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the filtering mode of <see cref="Radzen.Blazor.RadzenDataGrid{TItem}" />.
+/// </summary>
+public enum FilterMode
+{
+    /// <summary>
+    /// The component displays inline filtering UI and filters as you type.
+    /// </summary>
+    Simple,
+
+    /// <summary>
+    /// The component displays inline filtering UI and filters as you type combined with filter operator menu.
+    /// </summary>
+    SimpleWithMenu,
+
+    /// <summary>
+    /// The component displays a popup filtering UI and allows you to pick filtering operator and or filter by multiple values.
+    /// </summary>
+    Advanced,
+
+    /// <summary>
+    /// The component displays a popup filtering UI and allows you to pick multiple values from list of all values.
+    /// </summary>
+    CheckBoxList
+}
+

Radzen.Blazor/FilterOperator.cs

@@ -0,0 +1,93 @@
+namespace Radzen;
+
+/// <summary>
+/// Specifies the comparison operator of a filter.
+/// </summary>
+public enum FilterOperator
+{
+    /// <summary>
+    /// Satisfied if the current value equals the specified value.
+    /// </summary>
+    Equals,
+
+    /// <summary>
+    /// Satisfied if the current value does not equal the specified value.
+    /// </summary>
+    NotEquals,
+
+    /// <summary>
+    /// Satisfied if the current value is less than the specified value.
+    /// </summary>
+    LessThan,
+
+    /// <summary>
+    /// Satisfied if the current value is less than or equal to the specified value.
+    /// </summary>
+    LessThanOrEquals,
+
+    /// <summary>
+    /// Satisfied if the current value is greater than the specified value.
+    /// </summary>
+    GreaterThan,
+
+    /// <summary>
+    /// Satisfied if the current value is greater than or equal to the specified value.
+    /// </summary>
+    GreaterThanOrEquals,
+
+    /// <summary>
+    /// Satisfied if the current value contains the specified value.
+    /// </summary>
+    Contains,
+
+    /// <summary>
+    /// Satisfied if the current value starts with the specified value.
+    /// </summary>
+    StartsWith,
+
+    /// <summary>
+    /// Satisfied if the current value ends with the specified value.
+    /// </summary>
+    EndsWith,
+
+    /// <summary>
+    /// Satisfied if the current value does not contain the specified value.
+    /// </summary>
+    DoesNotContain,
+
+    /// <summary>
+    /// Satisfied if the current value is in the specified value.
+    /// </summary>
+    In,
+
+    /// <summary>
+    /// Satisfied if the current value is not in the specified value.
+    /// </summary>
+    NotIn,
+
+    /// <summary>
+    /// Satisfied if the current value is null.
+    /// </summary>
+    IsNull,
+
+    /// <summary>
+    /// Satisfied if the current value is <see cref="string.Empty"/>.
+    /// </summary>
+    IsEmpty,
+
+    /// <summary>
+    /// Satisfied if the current value is not null.
+    /// </summary>
+    IsNotNull,
+
+    /// <summary>
+    /// Satisfied if the current value is not <see cref="string.Empty"/>.
+    /// </summary>
+    IsNotEmpty,
+
+    /// <summary>
+    /// Custom operator if not need to generate the filter.
+    /// </summary>
+    Custom
+}
+

Radzen.Blazor/FlexWrap.cs

@@ -0,0 +1,23 @@
+namespace Radzen;
+
+/// <summary>
+/// Represents whether items are forced onto one line or can wrap onto multiple lines.
+/// </summary>
+public enum FlexWrap
+{
+    /// <summary>
+    /// The items are laid out in a single line.
+    /// </summary>
+    NoWrap,
+
+    /// <summary>
+    /// The items break into multiple lines.
+    /// </summary>
+    Wrap,
+
+    /// <summary>
+    /// The items break into multiple lines reversed.
+    /// </summary>
+    WrapReverse
+}
+

Radzen.Blazor/FormComponent.cs

@@ -39,8 +39,30 @@ namespace Radzen
         /// AutoCompleteType.</value>
         public virtual string AutoCompleteAttribute
         {
-            get => Attributes != null && Attributes.ContainsKey("AutoComplete") && $"{Attributes["AutoComplete"]}".ToLower() == "false" ? DefaultAutoCompleteAttribute :
-                Attributes != null && Attributes.ContainsKey("AutoComplete") ? Attributes["AutoComplete"] as string ?? AutoCompleteType.GetAutoCompleteValue() : AutoCompleteType.GetAutoCompleteValue();
+            get
+            {
+                if (Attributes != null && Attributes.TryGetValue("AutoComplete", out var value))
+                {
+                    var v = (object?)value;
+                    var autoCompleteValue = v switch
+                    {
+                        bool boolValue => boolValue
+                            ? AutoCompleteType.GetAutoCompleteValue()
+                            : DefaultAutoCompleteAttribute,
+                        string stringValue when bool.TryParse(stringValue, out var boolValue) => boolValue
+                            ? AutoCompleteType.GetAutoCompleteValue()
+                            : DefaultAutoCompleteAttribute,
+                        AutoCompleteType typeValue => typeValue.GetAutoCompleteValue(),
+                        _ => value != null ? value.ToString() ?? AutoCompleteType.GetAutoCompleteValue() : AutoCompleteType.GetAutoCompleteValue()
+                    };
+
+                    return string.Equals(autoCompleteValue, "false", StringComparison.OrdinalIgnoreCase)
+                        ? DefaultAutoCompleteAttribute
+                        : autoCompleteValue;
+                }
+
+                return AutoCompleteType.GetAutoCompleteValue();
+            }
         }
 
         /// <summary>
@@ -48,7 +70,7 @@ namespace Radzen
         /// </summary>
         public virtual string DefaultAutoCompleteAttribute { get; set; } = "off";
 
-        object ariaAutoComplete;
+        object? ariaAutoComplete;
 
         /// <inheritdoc />
         public override async Task SetParametersAsync(ParameterView parameters)
@@ -56,10 +78,10 @@ namespace Radzen
             parameters = parameters.TryGetValue("aria-autocomplete", out ariaAutoComplete) ?
                 ParameterView.FromDictionary(parameters
                     .ToDictionary().Where(i => i.Key != "aria-autocomplete").ToDictionary(i => i.Key, i => i.Value)
-                    .ToDictionary(i => i.Key, i => i.Value))
+                    .ToDictionary(i => i.Key, i => (object?)i.Value))
                 : parameters;
 
-            await base.SetParametersAsync(parameters);
+            await base.SetParametersAsync(parameters).ConfigureAwait(false);
         }
 
         /// <summary>
@@ -70,9 +92,11 @@ namespace Radzen
         /// <summary>
         /// Gets the aria-autocomplete attribute's string value.
         /// </summary>
-        public virtual string AriaAutoCompleteAttribute
+        public virtual string? AriaAutoCompleteAttribute
         {
-            get => AutoCompleteAttribute == DefaultAutoCompleteAttribute ? DefaultAriaAutoCompleteAttribute : ariaAutoComplete as string;
+            get => string.Equals(AutoCompleteAttribute, DefaultAutoCompleteAttribute, StringComparison.Ordinal)
+                ? DefaultAriaAutoCompleteAttribute
+                : ariaAutoComplete as string;
         }
 
     }
@@ -96,7 +120,7 @@ namespace Radzen
         /// </summary>
         /// <value>The component name.</value>
         [Parameter]
-        public string Name { get; set; }
+        public string? Name { get; set; }
 
         /// <summary>
         /// Gets or sets the tab order index for keyboard navigation.
@@ -112,7 +136,7 @@ namespace Radzen
         /// </summary>
         /// <value>The placeholder.</value>
         [Parameter]
-        public string Placeholder { get; set; }
+        public string? Placeholder { get; set; }
 
         /// <summary>
         /// Gets or sets a value indicating whether this <see cref="FormComponent{T}"/> is disabled.
@@ -124,21 +148,21 @@ namespace Radzen
         /// <summary>
         /// The form
         /// </summary>
-        IRadzenForm _form;
+        IRadzenForm? _form;
 
         /// <summary>
         /// Gets or sets the edit context.
         /// </summary>
         /// <value>The edit context.</value>
         [CascadingParameter]
-        public EditContext EditContext { get; set; }
+        public EditContext? EditContext { get; set; }
 
         /// <summary>
         /// Gets or sets the form.
         /// </summary>
         /// <value>The form.</value>
         [CascadingParameter]
-        public IRadzenForm Form
+        public IRadzenForm? Form
         {
             get
             {
@@ -189,14 +213,14 @@ namespace Radzen
         /// <summary>
         /// The value
         /// </summary>
-        protected T _value;
+        protected T? _value;
 
         /// <summary>
         /// Gets or sets the value.
         /// </summary>
         /// <value>The value.</value>
         [Parameter]
-        public virtual T Value
+        public virtual T? Value
         {
             get
             {
@@ -230,7 +254,7 @@ namespace Radzen
         /// </summary>
         /// <value>The value expression.</value>
         [Parameter]
-        public Expression<Func<T>> ValueExpression { get; set; }
+        public Expression<Func<T>>? ValueExpression { get; set; }
         /// <summary>
         /// Sets the parameters asynchronous.
         /// </summary>
@@ -262,7 +286,7 @@ namespace Radzen
         /// </summary>
         /// <param name="sender">The sender.</param>
         /// <param name="e">The <see cref="ValidationStateChangedEventArgs"/> instance containing the event data.</param>
-        private void ValidationStateChanged(object sender, ValidationStateChangedEventArgs e)
+        private void ValidationStateChanged(object? sender, ValidationStateChangedEventArgs e)
         {
             StateHasChanged();
         }
@@ -280,19 +304,21 @@ namespace Radzen
             }
 
             Form?.RemoveComponent(this);
+
+            GC.SuppressFinalize(this);
         }
 
         /// <summary>
         /// Gets the value.
         /// </summary>
         /// <returns>System.Object.</returns>
-        public object GetValue()
+        public object? GetValue()
         {
             return Value;
         }
 
         /// <summary>
-        /// Handles the <see cref="E:ContextMenu" /> event.
+        /// Handles the ContextMenu event.
         /// </summary>
         /// <param name="args">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
         /// <returns>Task.</returns>
@@ -318,10 +344,10 @@ namespace Radzen
 
         /// <summary> Provides support for RadzenFormField integration. </summary>
         [CascadingParameter]
-        public IFormFieldContext FormFieldContext { get; set; }
+        public IFormFieldContext? FormFieldContext { get; set; }
 
         /// <summary> Gets the current placeholder. Returns empty string if this component is inside a RadzenFormField.</summary>
-        protected string CurrentPlaceholder => FormFieldContext?.AllowFloatingLabel == true ? " " : Placeholder;
+        protected string? CurrentPlaceholder => FormFieldContext?.AllowFloatingLabel == true ? " " : Placeholder;
 
         /// <inheritdoc/>
         public virtual async ValueTask FocusAsync()

Radzen.Blazor/FormInvalidSubmitEventArgs.cs

@@ -0,0 +1,15 @@
+using System.Collections.Generic;
+
+namespace Radzen;
+
+/// <summary>
+/// Supplies information about a <see cref="Radzen.Blazor.RadzenTemplateForm{TItem}.InvalidSubmit" /> event that is being raised.
+/// </summary>
+public class FormInvalidSubmitEventArgs
+{
+    /// <summary>
+    /// Gets the validation errors.
+    /// </summary>
+    public IEnumerable<string>? Errors { get; set; }
+}
+

Radzen.Blazor/FrozenColumnPosition.cs

@@ -0,0 +1,18 @@
+namespace Radzen;
+
+/// <summary>
+/// Frozen Column Position enum
+/// </summary>
+public enum FrozenColumnPosition
+{
+    /// <summary>
+    /// Freeze column to the left
+    /// </summary>
+    Left,
+
+    /// <summary>
+    /// Freeze column to the right
+    /// </summary>
+    Right
+}
+