Something

using System;
using Gtk;
using GLib;

class X {
	static void Main (string [] args)
	{
	    Application.Init ();

	    GLib.Timeout.Add (3000, delegate {
		Console.WriteLine ("At {0}", DateTime.Now);
		System.Threading.Thread.Sleep (3000);
		Console.WriteLine ("Leave at {0}", DateTime.Now);
		return true;
	    });
	    Console.WriteLine ("At {0}", DateTime.Now);
	    Application.Run ();
	}
	
}