Temporarily Suspend/Stop Keyboard Inputs

Question

Hi,

My program takes a key input to switch between states:

Ex: 

private void Window_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
    switch (e.Key)
    {
        case System.Windows.Input.Key.PageUp:
            MoveBackward();
            break;
        case System.Windows.Input.Key.Next:
            // MessageBox.Show(currentState.ToString());
            MoveForward();
            break;
        case System.Windows.Input.Key.Escape:
            Application.Current.Shutdown();
            break;
        default:
            break;
    }
}

  

But, there are times when I'm playing a file in which I would like to temporarily suspend any input mouse/keyboard. Does anyone have any idea on how to accomplish that?

Thanks