gistfile1.txt

 public class ReqRepExample : Example
    {
        Context _context;

        public void Start(Context context)
        {
            _context = context;

            Task.Factory.StartNew(startServer);
            Task.Factory.StartNew(()=> startClient("1"));
        }

        void startClient(string id)
        {
            int count = 0;
            var sender = _context.Socket(SocketType.REQ);
            sender.Bind(@"tcp://127.0.0.1:5555");

            while (true)
            {
                Thread.Sleep(100);
                sender.Send(string.Format("Message {0}, sender {1}", count++, id), Encoding.Unicode);
                sender.Recv();
            }
        }

        void startServer()
        {
            var receiver = _context.Socket(SocketType.REP);
            receiver.Connect(@"tcp://127.0.0.1:5555");

            while (true)
            {
                string reply = receiver.Recv(Encoding.Unicode);
                Console.WriteLine("Received {0}", reply);
                receiver.Send(new byte[0]);
            }
        }
    }