using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

public class Win32 {
   [DllImport("winmm.dll", CharSet=CharSet.Auto)]
   public static extern bool sndPlaySound(string lpszSound, int fuSound);
}

public class HelloWinDotNet {
   public static void Main() {
      string windir = Environment.GetEnvironmentVariable("windir") ;
      string soundfile = windir + "\\MEDIA\\The Microsoft Sound.wav";
	DialogResult result = MessageBox.Show("HelloWinDotNet:   Play  \"The Microsoft Sound.wav\"  sound  ?? ", "HelloWinDotNet",
	MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
     if (result ==DialogResult.OK)
       Win32.sndPlaySound(soundfile, 0);
   }
}