protected override void DisposeNativeResources()
{
if (ScreenDC != IntPtr.Zero)
{
InteropMethods.ReleaseDC(IntPtr.Zero, ScreenDC);
}
if (WindowDC != IntPtr.Zero)
{
InteropMethods.DeleteDC(WindowDC);
}
if (BackgroundDC != IntPtr.Zero)
{
InteropMethods.DeleteDC(BackgroundDC);
}
}