int width = Screen.PrimaryScreen.Bounds.Width;

　　int height = Screen.PrimaryScreen.Bounds.Height;

　　Bitmap bmp = new Bitmap(width, height);

　　using (Graphics g = Graphics.FromImage(bmp))

　　{

　　g.CopyFromScreen(0, 0, 0, 0, new Size(width, height));

　　}

　　bmp.Save(@"c:\1.jpg");

　　bmp.Dispose();