private ImageInfo CreateImageFile(string fileName)

        {

            if (!File.Exists(fileName))

                return null;

            Image image = Image.FromFile(fileName);

            MemoryStream ms = new MemoryStream();

            image.Save(ms, ImageFormat.Png);

            image.Dispose();

            ImageInfo result = new ImageInfo();

            result.contentType = "image/png";

            result.fileContents = ms.ToArray();

            return result;

        }

        public ActionResult DisplayImage(string fileName)

        {

            ImageInfo imageInfo = CreateImageFile(Server.MapPath(fileName));

            if (imageInfo == null)

                return imageInfo == null ? "" : File(imageInfo.fileContents, imageInfo.contentType);

        }

　　　　<img src='/Home/DisplayImage?fileName=myimage.jpg'>