diff --git a/Cicm.Database/Models/Screen.cs b/Cicm.Database/Models/Screen.cs
index 4bd40351..678d8f66 100644
--- a/Cicm.Database/Models/Screen.cs
+++ b/Cicm.Database/Models/Screen.cs
@@ -42,8 +42,5 @@ namespace Cicm.Database.Models
         public virtual ICollection<ScreensByMachine>    ScreensByMachines { get; set; }
         [Required]
         public int NativeResolutionId { get; set; }
-
-        public override string ToString() =>
-            NativeResolution != null ? $"{Diagonal}\" {Type} at {NativeResolution}" : $"{Diagonal}\" {Type}";
     }
 }
\ No newline at end of file
diff --git a/cicm_web/Areas/Admin/Controllers/ResolutionsByScreenController.cs b/cicm_web/Areas/Admin/Controllers/ResolutionsByScreenController.cs
index ce5049df..de2a4076 100644
--- a/cicm_web/Areas/Admin/Controllers/ResolutionsByScreenController.cs
+++ b/cicm_web/Areas/Admin/Controllers/ResolutionsByScreenController.cs
@@ -45,8 +45,13 @@ namespace cicm_web.Areas.Admin.Controllers
         // GET: ResolutionsByScreen/Create
         public IActionResult Create()
         {
-            ViewData["ResolutionId"] = new SelectList(_context.Resolutions, "Id", "Id");
-            ViewData["ScreenId"]     = new SelectList(_context.Screens,     "Id", "Type");
+            ViewData["ResolutionId"] =
+                new SelectList(_context.Resolutions.Select(r => new {r.Id, Name = r.ToString()}).OrderBy(r => r.Name),
+                               "Id", "Name");
+            ViewData["ScreenId"] =
+                new
+                    SelectList(_context.Screens.Select(s => new {s.Id, Name = s.NativeResolution != null ? $"{s.Diagonal}\" {s.Type} at {s.NativeResolution}" : $"{s.Diagonal}\" {s.Type}"}).OrderBy(s => s.Name),
+                               "Id", "Name");
             return View();
         }
 
@@ -66,8 +71,12 @@ namespace cicm_web.Areas.Admin.Controllers
             }
 
             ViewData["ResolutionId"] =
-                new SelectList(_context.Resolutions, "Id", "Id", resolutionsByScreen.ResolutionId);
-            ViewData["ScreenId"] = new SelectList(_context.Screens, "Id", "Type", resolutionsByScreen.ScreenId);
+                new SelectList(_context.Resolutions.Select(r => new {r.Id, Name = r.ToString()}).OrderBy(r => r.Name),
+                               "Id", "Name", resolutionsByScreen.ResolutionId);
+            ViewData["ScreenId"] =
+                new
+                    SelectList(_context.Screens.Select(s => new {s.Id, Name = s.NativeResolution != null ? $"{s.Diagonal}\" {s.Type} at {s.NativeResolution}" : $"{s.Diagonal}\" {s.Type}"}).OrderBy(s => s.Name),
+                               "Id", "Name", resolutionsByScreen.ScreenId);
             return View(resolutionsByScreen);
         }
 
@@ -80,8 +89,12 @@ namespace cicm_web.Areas.Admin.Controllers
             if(resolutionsByScreen == null) return NotFound();
 
             ViewData["ResolutionId"] =
-                new SelectList(_context.Resolutions, "Id", "Id", resolutionsByScreen.ResolutionId);
-            ViewData["ScreenId"] = new SelectList(_context.Screens, "Id", "Type", resolutionsByScreen.ScreenId);
+                new SelectList(_context.Resolutions.Select(r => new {r.Id, Name = r.ToString()}).OrderBy(r => r.Name),
+                               "Id", "Name", resolutionsByScreen.ResolutionId);
+            ViewData["ScreenId"] =
+                new
+                    SelectList(_context.Screens.Select(s => new {s.Id, Name = s.NativeResolution != null ? $"{s.Diagonal}\" {s.Type} at {s.NativeResolution}" : $"{s.Diagonal}\" {s.Type}"}).OrderBy(s => s.Name),
+                               "Id", "Name", resolutionsByScreen.ScreenId);
             return View(resolutionsByScreen);
         }
 
@@ -113,8 +126,12 @@ namespace cicm_web.Areas.Admin.Controllers
             }
 
             ViewData["ResolutionId"] =
-                new SelectList(_context.Resolutions, "Id", "Id", resolutionsByScreen.ResolutionId);
-            ViewData["ScreenId"] = new SelectList(_context.Screens, "Id", "Type", resolutionsByScreen.ScreenId);
+                new SelectList(_context.Resolutions.Select(r => new {r.Id, Name = r.ToString()}).OrderBy(r => r.Name),
+                               "Id", "Name", resolutionsByScreen.ResolutionId);
+            ViewData["ScreenId"] =
+                new
+                    SelectList(_context.Screens.Select(s => new {s.Id, Name = s.NativeResolution != null ? $"{s.Diagonal}\" {s.Type} at {s.NativeResolution}" : $"{s.Diagonal}\" {s.Type}"}).OrderBy(s => s.Name),
+                               "Id", "Name", resolutionsByScreen.ScreenId);
             return View(resolutionsByScreen);
         }
 
@@ -147,5 +164,14 @@ namespace cicm_web.Areas.Admin.Controllers
         {
             return _context.ResolutionsByScreen.Any(e => e.Id == id);
         }
+
+        [AcceptVerbs("Get", "Post")]
+        public async Task<IActionResult> VerifyUnique(int screenId, int resolutionId)
+        {
+            return await _context.ResolutionsByScreen.FirstOrDefaultAsync(i => i.ScreenId     == screenId &&
+                                                                               i.ResolutionId == resolutionId) is null
+                       ? Json(true)
+                       : Json("The selected screen already has the selected resolution.");
+        }
     }
 }
\ No newline at end of file
diff --git a/cicm_web/Areas/Admin/Views/ResolutionsByScreen/Create.cshtml b/cicm_web/Areas/Admin/Views/ResolutionsByScreen/Create.cshtml
index e10814d9..bb4f0fa2 100644
--- a/cicm_web/Areas/Admin/Views/ResolutionsByScreen/Create.cshtml
+++ b/cicm_web/Areas/Admin/Views/ResolutionsByScreen/Create.cshtml
@@ -6,7 +6,7 @@
 
 <h1>Create</h1>
 
-<h4>ResolutionsByScreen</h4>
+<h4>Resolutions by screen</h4>
 <hr />
 <div class="row">
     <div class="col-md-4">
@@ -15,32 +15,42 @@
                  class="text-danger">
             </div>
             <div class="form-group">
-                <label asp-for="ScreenId"
+                <label asp-for="Screen"
                        class="control-label">
                 </label>
                 <select asp-for="ScreenId"
                         class="form-control"
                         asp-items="ViewBag.ScreenId">
                 </select>
+                <span asp-validation-for="ScreenId"
+                      class="text-danger">
+                </span>
             </div>
             <div class="form-group">
-                <label asp-for="ResolutionId"
+                <label asp-for="Resolution"
                        class="control-label">
                 </label>
                 <select asp-for="ResolutionId"
                         class="form-control"
                         asp-items="ViewBag.ResolutionId">
                 </select>
+                <span asp-validation-for="ResolutionId"
+                      class="text-danger">
+                </span>
             </div>
             <div class="form-group">
                 <input class="btn btn-primary"
                        type="submit"
                        value="Create" />
+                <a asp-action="Index"
+                   class="btn btn-secondary">
+                    Back to List
+                </a>
             </div>
         </form>
     </div>
 </div>
 
-<div>
-    <a asp-action="Index">Back to List</a>
-</div>
\ No newline at end of file
+@section Scripts {
+    @{ await Html.RenderPartialAsync("_ValidationScriptsPartial"); }
+}
\ No newline at end of file
diff --git a/cicm_web/cicm_web.csproj b/cicm_web/cicm_web.csproj
index 421e898f..ea0452db 100644
--- a/cicm_web/cicm_web.csproj
+++ b/cicm_web/cicm_web.csproj
@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
   <PropertyGroup>
     <TargetFramework>netcoreapp2.2</TargetFramework>
-    <Version>3.0.99.732</Version>
+    <Version>3.0.99.740</Version>
     <Company>Canary Islands Computer Museum</Company>
     <Copyright>Copyright © 2003-2018 Natalia Portillo</Copyright>
     <Product>Canary Islands Computer Museum Website</Product>