protected override void OnResume()
        {
            base.OnResume();
            if (CameraHelper.CheckCameraAvailability(this))
            {
                InitializeCamera();
            }
            else
            {
                AlertBox.Create("", "Your device does not seem to have camera.", this);
            }

            if (orientationManager != null)
            {
                orientationManager.Enable();
            }
        }