GUI Windows Forms C# Tutorial

using System;
using System.Drawing;
using System.ComponentModel;
using System.Windows.Forms;
using System.IO;
public class OpenFileDialogEvent{
    static OpenFileDialog openfiledlg1;
    public static void Main()
    {
        openfiledlg1 = new OpenFileDialog();
        openfiledlg1.FileOk += new CancelEventHandler(OnFileOpenOK);
        
        openfiledlg1.Filter = "C# files (*.cs)|*.cs|Bitmap files (*.bmp)|*.bmp";
        openfiledlg1.FilterIndex = 1;
        openfiledlg1.ShowDialog();
    }
    static void OnFileOpenOK(Object sender, CancelEventArgs e)
    {
        MessageBox.Show("You selected the file "+openfiledlg1.FileName);
    }
}