Use background thread to deal with the Server socket : Socket Server : Network C# Examples

    
using  System;
using  System.Text;
using  System.Threading;
using  System.Net;
using  System.Net.Sockets;

public  class  MainClass  {
        private  const  int  CONNECT_QUEUE_LENGTH  =  4;

        static  void  ListenForRequests()  {
                Socket  listenSock  =  new  Socket(  AddressFamily.InterNetwork,  SocketType.Stream,  ProtocolType.Tcp  );
                listenSock.Bind(  new  IPEndPoint(IPAddress.Any,  9999)  );
                listenSock.Listen(  CONNECT_QUEUE_LENGTH  );

                while(  true  )  {
                        Socket  newConnection  =  listenSock.Accept();
                        byte[]  msg  =  Encoding.UTF8.GetBytes(  "Hello!"  );
                        newConnection.BeginSend(  msg,0,  msg.Length,  SocketFlags.None,  null,  null  );
                }
        }

        static  void  Main()  {
                Thread  listener  =  new  Thread(new  ThreadStart(ListenForRequests)  );
                listener.IsBackground  =  true;
                listener.Start();

                Console.WriteLine(  "Press  <enter>  to  quit"  );
                Console.ReadLine();
        }
}