گرفتن و تسخیر کردن (Capture) تصویر صفحه نمایش

private void button1_Click(object sender, EventArgs e)
{
    this.BackgroundImage= CaptureScreen();
}
 
private Image CaptureScreen()
{
    Bitmap screen = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
        Screen.PrimaryScreen.Bounds.Height);
    using (Graphics g = Graphics.FromImage(screen))
    {
        g.CopyFromScreen(0, 0, 0, 0, screen.Size);
    }
    return screen;
}