출처 : http://dotnetmvp.tistory.com/60

//Server Side Code:

using System;

using System.Net.Sockets;

public class AsynchIOServer

{

public static void Main()

{

TCPListener tcpListener = new TCPListener(10);

tcpListener.Start();

SocketSocket socketForClient = tcpListener.Accept();

if (socketForClient.Connected)

{

Console.WriteLine("Client connected");

NetworkStream networkStream = new NetworkStream(socketForClient);

System.IO.StreamWriter streamWriter = new System.IO.StreamWriter(networkStream);

System.IO.StreamReader streamReader = new System.IO.StreamReader(networkStream);

string theString = "Sending";

streamWriter.WriteLine(theString);

Console.WriteLine(theString);

streamWriter.Flush();

theString = streamReader.ReadLine();

Console.WriteLine(theString);

streamReader.Close();streamReader.Close();

networkStream.Close();

streamWriter.Close();

}

socketForClient.Close();

Console.WriteLine("Exiting...");

}

//Client Code:

using System;

using System.Net.Sockets;

public class Client

{

static public void Main( string[] Args )

{

TCPClient socketForServer;

try

{

socketForServer = new TCPClient("localHost", 10);

}

catch

{

Console.WriteLine("Failed to connect to server at {0}:999", "localhost");

return;

}

NetworkStream networkStream = socketForServer.GetStream();

System.IO.StreamReader streamReader = new System.IO.StreamReader(networkStream);

System.IO.StreamWriter streamWriter = new System.IO.StreamWriter(networkStream);

try

{

string outputString;

// read the datadata from the host and display it

outputString = streamReader.ReadLine();

Console.WriteLine(outputString);

streamWriter.WriteLine("Client Message");

Console.WriteLine("Client Message");

streamWriter.Flush();

}

catch

{

Console.WriteLine("Exception reading from Server");

}

// tidy up

networkStream.Close();

}

C# TCPListener & TCPClient Socket Program