WinFormsHello.cs

// WinFormsHello.cs
//
// flycheck: gmcs /t:module /debug+ -pkg:dotnet %f
//
// ------------------------------------------------------------------
//

using System;
using System.Windows.Forms;

public class HelloWorld : Form
{
    static public void Main ()
    {
        Application.Run (new HelloWorld ());
    }

    public HelloWorld ()
    {
        Text = "Hello Mono World";
    }
}