C#

using System.Diagnostics; //needed for process
string strCmdLine; //string to hold your command
strCmdLine = "Net Send "+textBox1.Text + " " +textBox2.Text; //make your cmnd
Process.Start("CMD.exe",strCmdLine); // execute your command
process1.Close(); //close the process

<br />
Process p = new Process();<br />
p.StartInfo.FileName = "net.exe";<br />
p.StartInfo.Arguments = " send " + strTo + " " + message + " ";<br />
p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;<br />
Process.Start("net.exe",p.StartInfo.Arguments);<br />
p.Close();<br />

using System;<br />
using System.Runtime.InteropServices;<br />
<br />
namespace MyNetSend<br />
public class MyNetSend<br />
{<br />
   [DllImport("NETAPI32.dll", ExactSpelling = true, CharSet=CharSet.Unicode)]<br />
   public static extern Int32 NetMessageBufferSend (string   serverName, string msgName, string fromName, string buf, Int32 bufLen);<br />
<br />
   public SendNetSendMsg ()<br />
   {<br />
      string message = "this is a test message";<br />
      string userId = "auser"; // change to real user id.<br />
      NetMessageBufferSend (null, userId, null, message, message.Length * 2);<br />
   }<br />
}