private TcpListener BeginListener(string serverIP)
        {
            try
            {
                server = new TcpListener(IPAddress.Parse(serverIP), Port);
                server.Start();
            }
            catch 
            {
                if (server != null)
                {
                    server.Stop();
                    server.Server.Close();
                    server = null;
                    server = new TcpListener(IPAddress.Parse(serverIP), Port);
                    //Thread.Sleep(1000000000);
                }
            }
            return server;
        }