Implementing Network Protocol (Sockets)

Question

Hi, I'm having a hard time to implement a network protocol on my project.
I'm doing a socket program that pass iso8583 message to the server. But one of the requirements is a network protocol which is the length of the message that is 4 bytes.
Here's my code.
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 11000 on the local computer.
IPEndPoint remoteEP = new IPEndPoint(IPAddress.Parse("192.168.206.135"), 6004);
// 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
if (!sender.Connected)
sender.Connect(remoteEP);
string data = new Client().Test();
int len = data.Length;
byte[] msg = Encoding.ASCII.GetBytes(len.ToString());
int bytesSent = sender.Send(msg,SocketFlags.None);
//// Receive the response from the remote device.
int bytesRec = sender.Receive(bytes);
Console.WriteLine("Received = {0}",
Encoding.ASCII.GetString(bytes, 0, bytesRec));
sender.Shutdown(SocketShutdown.Both);
sender.Close();
catch (ArgumentNullException ane)
Console.WriteLine("ArgumentNullException : {0}", ane.ToString());
catch (SocketException se)
Console.WriteLine("SocketException : {0}", se.ToString());
catch (Exception e)
Console.WriteLine("Unexpected exception : {0}", e.ToString());
catch (Exception e)
Console.WriteLine(e.ToString());
Console.ReadLine();
Can someone help me with this and kindly check if my code is ok?

Answer 1

this is only for parsing and building ISO8583. i need to know how to append header details of the message that i will pass on the server. thanks btw