asp.net动态输出图片的代码

 System.Drawing.Image img = System.Drawing.Image.FromFile("c:\mm.jpg");
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            Response.ClearContent();
            Response.BinaryWrite(ms.ToArray());
            Response.ContentType = "image/jpeg";//指定输出格式为图形