using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
 
 
/*
 * Based on an example from Stackoverflow. 
 */
 
 
class MainClass
{
    public static void Main()
    {
        TcpListener client = new TcpListener(9050);
        client.Start();
 
        Console.WriteLine("Waiting for clients...");
        while (true)
        {
            while (!client.Pending())
                Thread.Sleep(1000);
 
            ConnectionThread newconnection = new ConnectionThread(client);
        }
    }
}
 
 
 
 
 
class ConnectionThread
{
    public TcpListener mThreadListener;
 
    /*
     * Constructor
     * 
     */
    public ConnectionThread(TcpListener lis)
    {
        mThreadListener = lis;
        ThreadPool.QueueUserWorkItem(new WaitCallback(HandleConnection));
    }
 
 
 
    /*  
     * Connection handler
     * 
     */
    public void HandleConnection(object pStateObj)
    {
        int lDataRead;
        byte[] lData = new byte[1024];
 
        TcpClient lClientSock = mThreadListener.AcceptTcpClient();
        NetworkStream lNetStream = lClientSock.GetStream();
        string lClientSys = lClientSock.Client.RemoteEndPoint.ToString();
 
        lData = Encoding.ASCII.GetBytes(String.Format("Hi {0}", lClientSys));
        lNetStream.Write(lData, 0, lData.Length);
 
        while (true)
        {
            lData = new byte[1024];
            lDataRead = lNetStream.Read(lData, 0, lData.Length);
            lNetStream.Write(lData, 0, lDataRead);
 
            Console.WriteLine(string.Format("{0} says : {1}\n\n", lClientSys, 
                              Encoding.ASCII.GetString(lData)));
        }
 
        lNetStream.Close();
        lClientSock.Close();
    }
}