void ReleaseUnManagedResource()
{
if (hRgn != IntPtr.Zero)
{
MyWin32.DeleteObject(hRgn);
hRgn = IntPtr.Zero;
}
MyWin32.DeleteDC(originalHdc);
originalHdc = IntPtr.Zero;
MyWin32.DeleteObject(hbmp);
hbmp = IntPtr.Zero;
clipRectStack.Clear();
currentClipRect = new System.Drawing.Rectangle(0, 0, this.Width, this.Height);
#if DEBUG
debug_releaseCount++;
#endif
}