public static string Connection()
        {

            string MesssageNotice = "";

            CancellationTokenSource c = new CancellationTokenSource();
            CancellationToken token = c.Token;
            Task<string> task = new Task<string>(() =>
            {
                try
                {
                    token.ThrowIfCancellationRequested();
                    TcpClient client = new TcpClient(AddressFamily.InterNetwork);
                    client.SendTimeout = 3000;
                    client.ReceiveTimeout = 3000;
                    client.Connect(IPAddress.Parse("XXXX.XXX.XXXX.XXX"), int.Parse("456"));
                    if (client.Connected)
                    {
                        Byte[] data = System.Text.Encoding.UTF8.GetBytes("ABCDEFGDSGFWEREW");
                        using (NetworkStream stream = client.GetStream())
                        {
                            stream.Write(data, 0, data.Length);
                            data = new Byte[client.ReceiveBufferSize];
                            string responseData = string.Empty;

                            
                            int bytes = stream.Read(data, 0, data.Length);
                            responseData = Encoding.UTF8.GetString(data, 0, bytes);
                            client.Close();
                            stream.Close();
                            MesssageNotice = responseData;
                            return MesssageNotice;
                        }
                    }
                    else
                    {
                        token.ThrowIfCancellationRequested();
                        c.Cancel();
                        MesssageNotice = "failed";
                        return MesssageNotice;
                    }
                }
                catch (SocketException)
                {
                    token.ThrowIfCancellationRequested();
                    c.Cancel();

                    //throw;
                    throw new Exception("failed");
                }
                catch (Exception)
                {
                    token.ThrowIfCancellationRequested();
                    c.Cancel();
                    throw;
                }
            }, token);
            task.Start();

            if (task.Wait(3000, token))
            {
                return task.Result;
            }
            else
            {
                c.Cancel();
                return "failed";
            }
        }