Client for checking open ports

Port Checker Client

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace PortChecker
{
    public partial class MainWindw : Form
    {
        System.Net.IPAddress ServerAddress = System.Net.IPAddress.Parse("178.32.186.41");
        int requestPort = 8080;
        Socket checkSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

        public MainWindw()
        {
            InitializeComponent();
        }

        private void GoCheck_Click(object sender, EventArgs e)
        {
                int scanPort = (int)PortNumberUD.Value;
                /*
                 * Do Check the port
                 */

                if (TCPPort.Checked)
                {
                    // Make the Request to the Checking server
                    MakeRequest("TCP", scanPort);
                    // TCP Port, Create a TCP socket, and form a connection to the Listen server
                    TCPPortCheck(scanPort);
                }
                else if (UDPPort.Checked)
                {
                    // UDP Port, Create a UDP socket, and then do the UDP thingy.
                    // Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
                    MessageBox.Show("This is not implimented yet.");
                }
        }

        public void TCPPortCheck(int portNumber)
        {
            // Socket checkSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint remoteEP = new System.Net.IPEndPoint(ServerAddress, portNumber);
            
            // Try to bind and listen to the socket.
            try
            {
                IPAddress localIP = (Dns.Resolve(IPAddress.Any.ToString()).AddressList[0]);
                IPEndPoint localEP = new IPEndPoint(localIP, portNumber);
                checkSock.Bind(localEP);
                checkSock.Listen(5);
            }
            catch (SocketException sockExep) { MessageBox.Show("Error:\n\n" + sockExep.Message);
            }

            Thread ListenThread = new Thread(ListenLoop);
            ListenThread.Start();


        }

        private void ListenLoop()
        {
            int checkiRx = 0;
            Stopwatch checkWatch = Stopwatch.StartNew();
            while (checkiRx == 0)
            {
                // Try to recieve some data. To check the port is working
                Socket handlerSock = checkSock.Accept();
                byte[] checkbuffer = new byte[1024];
                checkiRx = handlerSock.Receive(checkbuffer);
                if (checkiRx == 22)
                {
                    MessageBox.Show("Message Recieved:\n" + checkiRx.ToString());
                    Result.Text = "Port Open";
                }
                else if (checkWatch.ElapsedMilliseconds > 5000)
                {
                    Result.Text = "Port Close";
                    break;
                }
            }
        }

        private void MakeRequest(string portType, int portNumber)
        {
            Socket requestSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint requestEP = new System.Net.IPEndPoint(ServerAddress, requestPort);

            // Establish connection
            try
            {
                requestSock.Connect(requestEP);
                Result.Text = "Making Request";
            }
            catch (SocketException sockExep)
            {
                MessageBox.Show(sockExep.Message);
            }

            // Make the request
            try
            {
                string requestData = portType + "," + portNumber;
                byte[] byData = System.Text.Encoding.ASCII.GetBytes(requestData);
                requestSock.Send(byData);
                Result.Text = "Request Made";
            }
            catch (SocketException sockExep)
            {
                MessageBox.Show("Error:\n\n" + sockExep.Message);
            }

        }

        private void MainWindw_Load(object sender, EventArgs e)
        {

        }
    }
}