Как сделать скриншот полупрозрачных окон - C#

Формулировка задачи:

Исходный не делает скриншота прозрачных окон.

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
     
namespace WindowsApplication1 
{
    class HelloWorld
    {
        static void Main(string[] args)
            {
              Application.Run(new MyWindow());
        }
    }
 
  public partial class MyWindow : Form 
  {
    public MyWindow() {
      Size sz = Screen.PrimaryScreen.Bounds.Size;
      IntPtr hDesk = GetDesktopWindow();
      IntPtr hSrce = GetWindowDC(hDesk);
      IntPtr hDest = CreateCompatibleDC(hSrce);
      IntPtr hBmp = CreateCompatibleBitmap(hSrce, sz.Width, sz.Height);
      IntPtr hOldBmp = SelectObject(hDest, hBmp);
      bool b = BitBlt(hDest, 0, 0, sz.Width, sz.Height, hSrce, 0, 0, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt);
      Bitmap bmp = Bitmap.FromHbitmap(hBmp);
      SelectObject(hDest, hOldBmp);
      DeleteObject(hBmp);
      DeleteDC(hDest);
      ReleaseDC(hDesk, hSrce);
      bmp.Save(@"c:\temp\test.png");
      bmp.Dispose();
    }
 
    // P/Invoke declarations
    [DllImport("gdi32.dll")]
    static extern bool BitBlt(IntPtr hdcDest, int xDest, int yDest, int
    wDest, int hDest, IntPtr hdcSource, int xSrc, int ySrc, CopyPixelOperation rop);
    [DllImport("user32.dll")]
    static extern bool ReleaseDC(IntPtr hWnd, IntPtr hDc);
    [DllImport("gdi32.dll")]
    static extern IntPtr DeleteDC(IntPtr hDc);
    [DllImport("gdi32.dll")]
    static extern IntPtr DeleteObject(IntPtr hDc);
    [DllImport("gdi32.dll")]
    static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight);
    [DllImport("gdi32.dll")]
    static extern IntPtr CreateCompatibleDC(IntPtr hdc);
    [DllImport("gdi32.dll")]
    static extern IntPtr SelectObject(IntPtr hdc, IntPtr bmp);
    [DllImport("user32.dll")]
    public static extern IntPtr GetDesktopWindow();
    [DllImport("user32.dll")]
    public static extern IntPtr GetWindowDC(IntPtr ptr);
  }
}

Решение задачи: «Как сделать скриншот полупрозрачных окон»

textual
                            Листинг программы 
                        

                            Bitmap screenPicture = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
                 Screen.PrimaryScreen.Bounds.Height);
            using (Graphics g = Graphics.FromImage(screenPicture))
            {
                g.CopyFromScreen(0, 0, 0, 0, screenPicture.Size);
            }
                        