private void btnPause_Click(object sender, RoutedEventArgs e)
 {
     TimerClass.Pause();
 }
 private void Timer_Tick(object sender, object e)
 {
     txtboxDisplay.Text = TimerClass.UpdateTimeLabel();
 }
 private void btnStop_Click(object sender, RoutedEventArgs e)
 {
     StopTimer();
     TimerClass.Stop();
 }
        //private void txtboxDisplay_TextChanged(object sender, TextChangedEventArgs e)
        //{

        //}


        private void btnGo_Click(object sender, RoutedEventArgs e)
        {
            TimerClass.Start();
            StartTimer();
        }