Add SelfContained project.

SelfContained/Program.cs

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+// This is a simple example application for a self-contained single file.
+
+using System.Diagnostics.CodeAnalysis;
+using Terminal.Gui;
+
+namespace SelfContained;
+
+public static class Program
+{
+    [RequiresUnreferencedCode ("Calls Terminal.Gui.Application.Run<T>(Func<Exception, Boolean>, ConsoleDriver)")]
+    private static void Main (string [] args)
+    {
+        Application.Run<ExampleWindow> ().Dispose ();
+
+        // Before the application exits, reset Terminal.Gui for clean shutdown
+        Application.Shutdown ();
+
+        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);
+    }
+}