C# Socket Client and Server  Program Examples 

Server Side Code

: using System;using System.Net.Sockets; 

public class AsynchIOServer
{

public static void Main()
{
        TCPListener tcpListener = new TCPListener(10);
       tcpListener.Start();
       Socket 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();
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 data 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 upnetworkStream.Close();

}
}