public void ResumeRecording()
 {
     try
     {
         if (mediaRecorder == null)
         {
             return;
         }
         if (timer != null)
         {
             timer.Start();
         }
         IsRecorderPlaying = true;
         IsRecorderPause   = false;
         mediaRecorder.Resume();
     }
     catch (System.Exception ex)
     {
     }
 }