public static void StartListening()
    {
        // Data buffer for incoming data.
        byte[] bytes = new Byte[1024];

        // Establish the local endpoint for the socket.
        // The DNS name of the computer
        // running the listener is "host.contoso.com".
        IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
        IPAddress ipAddress = ipHostInfo.AddressList[0];
        IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 4444);

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

        // Bind the socket to the local endpoint and listen for incoming connections.
        try
        {
            listener.Bind(localEndPoint);
            listener.Listen(100);


            while (true)
            {
                // Set the event to nonsignaled state.
                allDone.Reset();

                // Start an asynchronous socket to listen for connections.
                Console.WriteLine("Listening...");


                listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);



                // Wait until a connection is made before continuing.
                allDone.WaitOne();


            }

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

        Console.WriteLine("\nPress ENTER to continue...");
        Console.Read();

    }

    public static void AcceptCallback(IAsyncResult ar)
    {
        // Signal the main thread to continue.
        allDone.Set();

        // Get the socket that handles the client request.
        Socket listener = (Socket)ar.AsyncState;
        Socket handler = listener.EndAccept(ar);

        StateObject client = new StateObject();

        int i = Clients.Add(client);
        Console.WriteLine("Client " + i.ToString() + " Connected");


        client.workSocket = handler;
        handler.BeginReceive(client.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), client);



    }

    public static void ReadCallback(IAsyncResult ar)
    {
        String content = String.Empty;

        // Retrieve the state object and the handler socket
        // from the asynchronous state object.
        StateObject state = (StateObject)ar.AsyncState;
        Socket handler = state.workSocket;

        // Read data from the client socket.
        int bytesRead = handler.EndReceive(ar);

        if (bytesRead > 0)
        {
            // There  might be more data, so store the data received so far.
            state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

            // Check for end-of-file tag. If it is not there, read
            // more data.
            content = state.sb.ToString();

            if (content.IndexOf("<EOF>") > -1)
            {
                Console.WriteLine(content);
                string[] Data;
                string Message = "";
                Data = content.Split('|');


                if (Data[0] == "0000")
                {

                    Send(client.workSocket, Message);
                }


                Console.WriteLine("0001");





            }
            else
            {

                // Not all data received. Get more.
                Console.WriteLine("Need More Data");
                handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                new AsyncCallback(ReadCallback), state);

            }
        }
    }

    private static void Send(Socket handler, string data)
    {
        try
        {
            // Convert the string data to byte data using ASCII encoding.
            byte[] byteData = Encoding.ASCII.GetBytes(data);
            Console.WriteLine("Sending Data");
            // Begin sending the data to the remote device.
            handler.BeginSend(byteData, 0, byteData.Length, 0, new AsyncCallback(SendCallback), handler);
        }
        catch (Exception e)
        {

            Console.WriteLine("Couldn't Send Data to Socket");


        }

    }

    private static void SendCallback(IAsyncResult ar)
    {
        try
        {

            // Retrieve the socket from the state object.
            Socket handler = (Socket)ar.AsyncState;


            // Complete sending the data to the remote device.
            int bytesSent = handler.EndSend(ar);
            //Console.WriteLine("Sent {0} bytes to client.", bytesSent);
            Console.WriteLine("Data Sent");



        }
        catch (Exception e)
        {

            Console.WriteLine(e.ToString());

        }
    }