/// <summary>
 /// Initial device state might be uncalibrated,
 /// but device was subsequently calibrated.
 /// </summary>
 /// <param name="sender">Source of the device updated event</param>
 /// <param name="e">Event args for the device updated event</param>
 private void DeviceUpdated(GazeDeviceWatcherPreview source,
                            GazeDeviceWatcherUpdatedPreviewEventArgs args)
 {
     // Set up gaze tracking.
     TryEnableGazeTrackingAsync(args.Device);
 }
 private void OnDeviceUpdated(GazeDeviceWatcherPreview sender, GazeDeviceWatcherUpdatedPreviewEventArgs args)
 {
     Log("Device updated", args.Device);
 }