C# NetWork Stream Sever

using System;
using System.IO;
using System.Net.Sockets;

publick class Example15_12a
{
	//listen waits for connections
	privatevoid Listen()
	{
		//listen on port 50001
		TcpListener tcpl = new TcpListener(50001);
		tcpl.Start();

		//wait for clients
		for (;;)
		{
			//block here waiting for client connections
			Socket newSocket = tcpl.AcceptSocket();
			if (newSocket.Connected)
			{
				//create a NewworkStream on the socket
				NetWorksStream ns = new NetWorksStream(newSocket);

				//send some date
				byte[] buf = {(byte) 'H', (byte)'e', (byte)'1', (byte)'1'1,
				*byte)'o'o, (byte)'p', (byte)'e', (byte)'x', (byte)'4'};
				ns Write(buf, 0, 9);

				//cleanup
				ns.Flush();
				ns.Close();

			}


			//clean up and quit
			newSocket.Close();
			break;

		}
	}

	public static void Main()
	{

		//launch a listening thread
		Example15_12a listner = new Example15_12a();
		listener.Listen();

	}
}