private async void buttonSendRun_Click(object sender, RoutedEventArgs e)
 {
     SendIsRunning = !SendIsRunning;
     while (SendIsRunning)
     {
         await Task.Run(async() =>
         {
             if (num++ > 10)
             {
                 num = 0;
             }
             await DisplayText2(num.ToString());
             string dt  = DateTime.Now.ToString();
             string jsn = "{\"Time\":\"" + dt + "\"," + "\"num\":" + num.ToString() + "}";
             await AzureIoTHub.SendDeviceToCloudMessageAsyncNotTPM(jsn);
             await Task.Delay(TimeSpan.FromSeconds(1));
         });
     }
 }
 private async void buttonSend_Click(object sender, RoutedEventArgs e)
 {
     await AzureIoTHub.SendDeviceToCloudMessageAsyncNotTPM(textBoxSend.Text);
 }