private async void btnPwr_Click(object sender, RoutedEventArgs e) { await Task.Run(async() => { try { await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => { this.btnPwr.Background = new SolidColorBrush(Colors.LawnGreen); this.btnMute.IsEnabled = false; _timerPowerBlink.Start(); }); rv.PJLinkConnection c = connectBeamer(); PowerCommand.PowerStatus powStat = PowerCommand.PowerStatus.UNKNOWN; try { powStat = await c.powerQuery(); } catch (Exception) { try { powStat = await c.powerQuery(); } catch (Exception) { } } switch (powStat) { case PowerCommand.PowerStatus.OFF: case PowerCommand.PowerStatus.COOLING: case PowerCommand.PowerStatus.UNKNOWN: await c.turnOn(); await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => { _timerPowerCheck.Interval = new TimeSpan(0, 0, 5); //10 sec; }); break; case PowerCommand.PowerStatus.ON: case PowerCommand.PowerStatus.WARMUP: await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => { this.btnPwr.Background = btndefBack; this.btnMute.IsEnabled = false; _timerMuteBlink.Stop(); _timerPowerBlink.Stop(); btnMute.Background = btndefBack; }); await c.turnOff(); break; } } catch (Exception) { } }); }