Started editing axaml page but kept running into `Request textDocumen…

…t/completion failed. Error - System.ArgumentOutOfRangeException: Index and length must refer to a location within the string. (Parameter 'length')

   at System.String.ThrowSubstringArgumentOutOfRange(Int32 startIndex, Int32 length)`
Try on another machine.

ViewModels/AddPageViewModel.cs

@@ -5,11 +5,24 @@
 using System.Text;
 using System.Threading.Tasks;
 using AvaloniaGUI.Models;
+using ReactiveUI;
 
 namespace AvaloniaGUI.ViewModels
 {
-    public class AddPageViewModel
+    public class AddPageViewModel : ReactiveObject
     {
         // Create instance of the Card class in here. Use RaiseAndSetIfChanged to detect change and bind to the views.
+        private Card _card;
+
+        public Card Card
+        {
+            get => _card;
+            set => this.RaiseAndSetIfChanged(ref _card, value);
+        }
+
+        public AddPageViewModel()
+        {
+            Card = new Card();
+        }
     }
 }

Views/AddPage.axaml

@@ -18,11 +18,11 @@
 			<StackPanel Orientation="Vertical">
 
 				<!-- Code -->
-				<TextBlock Text="Card Code" FontSize="12" Margin="0,10" HorizontalAlignment="Center"/>
+				<TextBlock Text="{Binding Card.Code}" FontSize="12" Margin="0,10" HorizontalAlignment="Center"/>
 				<TextBox x:Name="CardCodeTxtBox" Margin="0,0,0,10" Width="200"/>
 
 				<!-- Name -->
-				<TextBlock Text="Card Name" FontSize="12" Margin="0,10" HorizontalAlignment="Center"/>
+				<TextBlock Text="{Binding Card.Name}" FontSize="12" Margin="0,10" HorizontalAlignment="Center"/>
 				<TextBox x:Name="CardNameTxtBox" Margin="0,0,0,10" Width="200"/>
 
 				<!-- Type -->