Bitmap bmp = null;
            SIZE size;

            size.cx = Screen.PrimaryScreen.Bounds.Width;
            size.cy = Screen.PrimaryScreen.Bounds.Height;

            IntPtr Src = PlatformInvokeUSER32.GetDC(IntPtr.Zero);
            IntPtr Dest = PlatformInvokeGDI32.CreateCompatibleDC(Src);
            IntPtr HBitmap = (IntPtr)null;
            IntPtr hOld = IntPtr.Zero;

            HBitmap = PlatformInvokeGDI32.CreateCompatibleBitmap(Src, size.cx, size.cy);

            hOld = (IntPtr)PlatformInvokeGDI32.SelectObject(Dest, HBitmap);

            PlatformInvokeGDI32.BitBlt(Dest, 0, 0, size.cx, size.cy, Src, 0, 0, PlatformInvokeGDI32.SRCCOPY);
            PlatformInvokeGDI32.SelectObject(Dest, hOld);
            PlatformInvokeGDI32.DeleteDC(Dest);
            PlatformInvokeUSER32.ReleaseDC(IntPtr.Zero, Src);

            bmp = System.Drawing.Image.FromHbitmap(HBitmap);

            PlatformInvokeGDI32.DeleteObject(HBitmap);

            return bmp;