Fixed doc issues (#3835)

README.md

@@ -49,91 +49,7 @@ The team is looking forward to seeing new amazing projects made by the community
 
 The following example shows a basic Terminal.Gui application in C#:
 
-```csharp
-// This is a simple example application.  For the full range of functionality
-// see the UICatalog project
-
-// A simple Terminal.Gui example in C# - using C# 9.0 Top-level statements
-
-using System;
-using Terminal.Gui;
-
-Application.Run<ExampleWindow> ().Dispose ();
-
-// Before the application exits, reset Terminal.Gui for clean shutdown
-Application.Shutdown ();
-
-// To see this output on the screen it must be done after shutdown,
-// which restores the previous screen.
-Console.WriteLine ($@"Username: {ExampleWindow.UserName}");
-
-// Defines a top-level window with border and title
-public class ExampleWindow : Window
-{
-    public static string UserName;
-
-    public ExampleWindow ()
-    {
-        Title = $"Example App ({Application.QuitKey} to quit)";
-
-        // Create input components and labels
-        var usernameLabel = new Label { Text = "Username:" };
-
-        var userNameText = new TextField
-        {
-            // Position text field adjacent to the label
-            X = Pos.Right (usernameLabel) + 1,
-
-            // Fill remaining horizontal space
-            Width = Dim.Fill ()
-        };
-
-        var passwordLabel = new Label
-        {
-            Text = "Password:", X = Pos.Left (usernameLabel), Y = Pos.Bottom (usernameLabel) + 1
-        };
-
-        var passwordText = new TextField
-        {
-            Secret = true,
-
-            // align with the text box above
-            X = Pos.Left (userNameText),
-            Y = Pos.Top (passwordLabel),
-            Width = Dim.Fill ()
-        };
-
-        // Create login button
-        var btnLogin = new Button
-        {
-            Text = "Login",
-            Y = Pos.Bottom (passwordLabel) + 1,
-
-            // center the login button horizontally
-            X = Pos.Center (),
-            IsDefault = true
-        };
-
-        // When login button is clicked display a message popup
-        btnLogin.Accept += (s, e) =>
-                           {
-                               if (userNameText.Text == "admin" && passwordText.Text == "password")
-                               {
-                                   MessageBox.Query ("Logging In", "Login Successful", "Ok");
-                                   UserName = userNameText.Text;
-                                   Application.RequestStop ();
-                               }
-                               else
-                               {
-                                   MessageBox.ErrorQuery ("Logging In", "Incorrect username or password", "Ok");
-                               }
-                           };
-
-        // Add the views to the Window
-        Add (usernameLabel, userNameText, passwordLabel, passwordText, btnLogin);
-    }
-}
-```
+[!code-csharp[](./Example/Example.cs)]
 
 When run the application looks as follows: