user.ReleaseDC(null, screenDC);
if (hBitmap != null) {
gdi.SelectObject(memDC, oldBitmap);
gdi.DeleteObject(hBitmap);
}
gdi.DeleteDC(memDC);
}
}
else if (a) {
BLENDFUNCTION blend = new BLENDFUNCTION();
blend.SourceConstantAlpha = (byte)(alpha * 255);