Warnings fixed

RadzenBlazorDemos/Pages/DataGridColumnEnumFilter.razor

@@ -11,9 +11,7 @@
 </RadzenDataGrid>
 
 @code {
-    int count;
     IEnumerable<Employee> employees;
-    bool isLoading = false;
 
     public class Employee
     {

RadzenBlazorDemos/Pages/SchedulerPlannerTimeline.razor

@@ -75,6 +75,7 @@
     async Task OnMonthSelect(SchedulerMonthSelectEventArgs args)
     {
         console.Log($"MonthSelect: MonthStart={args.MonthStart} AppointmentCount={args.Appointments.Count()}");
+        await Task.CompletedTask;
     }
 
     async Task OnAppointmentSelect(SchedulerAppointmentSelectEventArgs<Appointment> args)

RadzenBlazorDemos/Pages/TreeContextMenu.razor

@@ -23,8 +23,6 @@
         employees = allEmployees.Where(e => e.ReportsTo == null);
     }
 
-    Employee draggedItem;
-
     void ItemContextMenu(TreeItemContextMenuEventArgs args)
     { 
         ContextMenuService.Open(args,