private void StartTimer() { _locationService.startGPSTraking(); IsActivated = true; isInTicked = false; ProgressAnimationLength = 10; ProgressPracentage = 1; CountdownTimer = TimerPickersViewModel[(int)UserExercizeMode].Time; Time = CountdownTimer; _timer = new CountDownTimer(Time); _timer.Completed += OnCountdownTimerCompleted; _timer.Ticked += OnCountdownTimerTicked; _timer.Paused += OnCountdownTimerPaused; _textToSpeach.SpeakNow("Lets go!"); _timer.Start(); }