把图片以二进制保存到数据库，提交的时候如何会有上载提示啊晕

            Images img = new Images();
            var file = Request.Files["img"];
            byte[] b = new byte[file.ContentLength];
            Stream s = file.InputStream;
            s.Read(b, 0, file.ContentLength);
            s.Close();
            img.img = b;
            img.type = file.ContentType;
            bool f = manager.SaveImage(img);
            if (f)
            {
                return Json("success");
            }
            else
            {
                return Json("fail");
            }