execute windows message service in .net (asp.net)

Today, I find a very very fun thing that we can execute windows API in .net.

eg, I call the message service..

  public int SendMessage(string sFrom,string sTo,string sMessage)
  {
   byte[] bBuffer = System.Text.Encoding.Unicode.GetBytes(sMessage);
   int nRet = NetMessageBufferSend(null,sTo,null,sMessage,sMessage.Length*2+2);
   return nRet;
  }
//using System.Runtime.InteropServices;

  [DllImport ("Netapi32", CharSet=CharSet.Unicode)]
  public static extern int NetMessageBufferSend( string servername, string msgname, string fromname, string buf, int buflen);