listener.Start();

            while (running)
            {
                Console.WriteLine("Listening for connection");
                s = listener.AcceptSocket();
                Console.WriteLine("Connection accepted from: " + s.RemoteEndPoint);

                byte[] b = new byte[100];
                int k = s.Receive(b);
                Console.WriteLine("Received message");
                string message = "";
                for (int i = 0; i < k; i++)
                {
                    message += Convert.ToChar(b[i]);
                }
                Console.WriteLine(message);

                if (message == "exitprogram") //break loop
                {
                    break;
                }

                ASCIIEncoding asen = new ASCIIEncoding();
                s.Send(asen.GetBytes(message));
            }

Stream stm = client.GetStream();

        ASCIIEncoding asen = new ASCIIEncoding();
        byte[] ba = asen.GetBytes(ChatSender.Text);

        stm.Write(ba, 0, ba.Length);

        byte[] bb = new byte[100];
        int k = stm.Read(bb, 0, 100);
        string message = "";
        for(int i = 0; i < k; i++)
        {
            message += Convert.ToChar(bb[i]);
        }
        ChatLog.Text += message + "n";