添加图片水印代码

        string path=Server.MapPath("qq.jpg");
            System.Drawing.Image image = System.Drawing.Image.FromFile(path);
            System.Drawing.Image copyImage = System.Drawing.Image.FromFile( Server.MapPath("logo3.gif"));
            Graphics g = Graphics.FromImage(image);
            g.DrawImage(copyImage, new Rectangle(image.Width-copyImage.Width, image.Height-copyImage.Height, copyImage.Width, copyImage.Height),0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
            g.Dispose();
            image.Save(Server.MapPath("abc.jpg"));