int kPort = PORT.Length;

            if ((3 < kPort) && (kPort < 6))

            {

                for (int i = 0; i < kPort; i++)

                {

                    if ((PORT[i] < '0') || (PORT[i] > '9'))

                    {

                        TruePort = false;

                    }

                }

            }

            else

            {

                TruePort = false;

            }

            return TruePort;

        }

        public bool CreateServer()

        {

            try

            {

                localAddr = IPAddress.Parse(tbIP.Text);

                port = Int32.Parse(tbPort.Text);

                server = new TcpListener(localAddr, port);

                server.Start();

                connect = true;

                return true;

            }

            catch (Exception)

            {

                connect = false;

                return false;

            }

        }

        public void WriteIpAtFile(string PORT, string Ip)

        {

            StreamWriter sw = new StreamWriter(@AppDomain.CurrentDomain.BaseDirectory + "ip.txt");

            sw.WriteLine(PORT + " " + Ip);

            sw.Close();

        }

        public void Connect()

        {

            try

            {

                while (true)

                {

                    try

                    {