public Bitmap GetScreen() {
            Bitmap bmp = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
                Screen.PrimaryScreen.Bounds.Height);
            using (Graphics g = Graphics.FromImage(bmp)) {
                g.CopyFromScreen(0, 0, 0, 0, bmp.Size);
                SolidBrush sb = new SolidBrush(Color.FormArgb(125,0,0,0));
                g.FillRectangle(sb,0,0,bmp.Width,bmp.Height);
                sb.Dispose();
            }
            return bmp;
        }