public FileContentResult CommentUserImage(string id)
        {
            var image = this.images.GetUserImageById(id);

            if (image == null)
            {
                var file = ConvertImage.ToBytes("/Images/default-user-img.jpg");

                return(this.File(file, "image/jpg"));
            }

            return(this.File(image.Content, "image/" + image.FileExtension));
        }