将程序分配到按钮GUI界面

我想把我的程序，我已经建立并分配它运行时，onrunapplication按钮在我的GUI界面点击:

using System;
using Gtk;
public partial class MainWindow: Gtk.Window
{   
public MainWindow (): base (Gtk.WindowType.Toplevel)
{
    Build ();
}
protected void OnDeleteEvent (object sender, DeleteEventArgs a)
{
    Application.Quit ();
    a.RetVal = true;
}
protected void OnExitbuttonClicked (object sender, EventArgs e)
{
    Application.Quit();
}
protected void OnRunapplicationClicked (object sender, EventArgs e)
{
    ???
}
}

这是我要运行的程序的开头:

using System;
using Gtk;
using System.IO;
using System.Net;
namespace namelookup
{
    class MainClass
    {
    public static void Main(string[] args)
    {