screenshot of whole screen and active window with .NET Framework

screenshot.cs

String filename(String val)
{
    String my_dir = "d:\\user temp\\20211204\\";
    String my_file = DateTime.Now.ToString("hhmmss") + ".jpg";
    return (my_dir + val + my_file);

}

Size screen_size = new Size(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
Size window_size = this.Size;

var screen_bmp = new Bitmap(screen_size.Width, screen_size.Height);
var window_bmp = new Bitmap(window_size.Width, window_size.Height);

var screen_shot = Graphics.FromImage(screen_bmp);
var window_capture = Graphics.FromImage(window_bmp);

screen_shot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, screen_size);
window_capture.CopyFromScreen(this.Location.X, this.Location.Y, 0, 0, window_size);

screen_bmp.Save(filename("screen"), System.Drawing.Imaging.ImageFormat.Jpeg);
window_bmp.Save(filename("window"), System.Drawing.Imaging.ImageFormat.Jpeg);