C# TCP Authentication HELP!!

Question

ey guys,

So recently I made this simple TCP server. What I want it to do now is, when the employee enters the id, it will go to the server, check it see if it exists -- if not, it simply returns an error message in the console and doesn't load the form. Here is what I have now.

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

public class serv
{
    public static void Main()
    {
       int c = 1234;
        try
        {
            IPAddress ipAd = IPAddress.Parse("69.10.61.145"); //use local m/c IP address, and use the same in the client

            /* Initializes the Listener */
            TcpListener myList = new TcpListener(ipAd, 7575);

            /* Start Listeneting at the specified port */
            myList.Start();

            Console.WriteLine("Login Server is running.");
            Console.WriteLine("Connection :" + myList.LocalEndpoint);
            Console.WriteLine("Waiting for logins...");
            Console.WriteLine("================================");

            Socket s = myList.AcceptSocket();
            Console.WriteLine("Connection accepted from: " + s.RemoteEndPoint);

            byte[] b = new byte[100];
            int k = s.Receive(b);
            

            
            Console.WriteLine("Login Attempt Recieved from: " + s.RemoteEndPoint);
            for (int i = 0; i < k; i++)
                Console.Write(Convert.ToChar(b[i]));
            

            ASCIIEncoding asen = new ASCIIEncoding();
            

      
           


                s.Send(asen.GetBytes("Login is invalid." + s.RemoteEndPoint));
                Console.WriteLine("\nAccess Denied.");
                Console.ReadLine();
                return;
                /* clean up */
            }
         

        
        catch (Exception e)
        {
            Console.WriteLine("Error..... " + e.StackTrace);
            Console.ReadLine();
        }
    }

}

I have the client done, I'm willing to manually add the employee id's in there, I just need help with bytes to int's etc.