c# 保存屏幕到图片中

    public void getScreen()
    {
        Image myImage = new Bitmap(1024, 768);
        Graphics g = Graphics.FromImage(myImage);

        g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(1024, 768));
        IntPtr dc1 = g.GetHdc();
        g.ReleaseHdc(dc1);
        String path = Server.MapPath("~/");
        Random objRand = new Random();
        String pic_name = DateTime.Now.ToString("yyyyMMddHHmmssffff") + ".jpg";
        string allpathname = path + pic_name;
        myImage.Save(allpathname);
    }