TELNET into Server

Question

please help

I am trying to telnet into a zebra printer with C# and then run through the menu with values I supply and then want to be returned a value.

This is my code thus far: When I telnet with putty, I get prompted for a password, then after i put in the password I get the menu. So in my code I want to give the value "1234" as the password and I then want to be returned the menu. Please help Im stuck :(

public static void StartClient() {
    // Data buffer for incoming data.
    byte[] bytes = new byte[1024];
    // Connect to a remote device.
    try {
        // Establish the remote endpoint for the socket.
        // This example uses port 23 on the Server.
        IPHostEntry ipHostInfo = Dns.Resolve("10.121.237.151");//Dns.GetHostName());
        IPAddress ipAddress = ipHostInfo.AddressList[0];
        IPEndPoint remoteEP = new IPEndPoint(ipAddress,23);

        // Create a TCP/IP  socket.
        Socket sender = new Socket(AddressFamily.InterNetwork,
            SocketType.Stream, ProtocolType.Tcp );

        // Connect the socket to the remote endpoint. Catch any errors.
        try {
            sender.Connect(remoteEP);

            Console.WriteLine("Socket connected to {0}",
                sender.RemoteEndPoint.ToString());

            // Encode the data string into a byte array.
            byte[] msg = Encoding.ASCII.GetBytes("1234/n/r");


            // Send the data through the socket.
            int bytesSent = sender.Send(msg);

            // Receive the response from the remote device.
            int bytesRec = sender.Receive(bytes);
            //Console.WriteLine(msg.ToString());
            //Console.WriteLine("Echoed test = {0}",
            //    Encoding.ASCII.GetString(bytes,0,bytesRec));
            //Console.ReadLine();

            // Release the socket.
            sender.Shutdown(SocketShutdown.Both);
            sender.Close();
            Console.ReadLine();

        } catch (ArgumentNullException ane) {
            Console.WriteLine("ArgumentNullException : {0}",ane.ToString());
            Console.ReadLine();
        } catch (SocketException se) {
            Console.WriteLine("SocketException : {0}",se.ToString());
            Console.ReadLine();
        } catch (Exception e) {
            Console.WriteLine("Unexpected exception : {0}", e.ToString());
            Console.ReadLine();
        }

    } catch (Exception e) {
        Console.WriteLine( e.ToString());
        Console.ReadLine();
    }
}