// Server
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace ConsoleApplication25
{
    class Class1
    {
        TcpListener tl;
        public static void Main()
        {
            Class1 c = new Class1();
            c.beginWork();
        }
        private void beginWork()
        {
            tl = new TcpListener(IPAddress.Any, 4050);
            Thread lt = new Thread(new ThreadStart(Listen));
            lt.Start();
        }
        private void Listen()
        {
            tl.Start();
		TcpClient client;
            while (true)
            {
                client = tl.AcceptTcpClient();
                Thread clientThread = new Thread(new
                ParameterizedThreadStart(HandleClientComm));
                clientThread.Start(client);
            }
        }
        private void HandleClientComm(object client)
        {
            TcpClient tcpClient = (TcpClient)client;
            NetworkStream ns = tcpClient.GetStream();
            byte message = new byte;
            int bytesRead;
            while (true)
            {
                try
                {
                    bytesRead = ns.Read(message, 0, 4096);
                }
                catch
                {
                    break;
                }
                if (bytesRead == 0)
                    break;
                ASCIIEncoding encoder = new ASCIIEncoding();
                Console.WriteLine(encoder.GetString(message, 0, 
                bytesRead));
            
            }
            tcpClient.Close();
        }
    }
}
// Client
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
namespace ConsoleApplication24
{
    class Class1
    {
        public static void Main()
        {
            TcpClient client = new TcpClient();
            IPEndPoint serverEndPoint =
               new IPEndPoint(IPAddress.Parse("127.0.0.1"), 4050);
            client.Connect(serverEndPoint);
            NetworkStream clientSt
ream = client.GetStream();
            ASCIIEncoding encoder = new ASCIIEncoding();
            byte buffer = encoder.GetBytes("Hello Server!");
            clientStream.Write(buffer, 0, buffer.Length);
            clientStream.Flush();
        }
    }
}