public static MvcHtmlString GalleryPicture(this HtmlHelper helper, Gallery gallery, PictureSize size) {
     if (string.IsNullOrEmpty(gallery.DefaultPhoto))
         return MvcHtmlString.Empty;
     var url = new UrlHelper(helper.ViewContext.RequestContext);
     return MvcHtmlString.Create(string.Format("<img  width='200' src='{0}{3}/{4}/{2}' title='{1}'/>", url.Content("~/public/userfiles/galleries/"), gallery.Title, gallery.DefaultPhoto, size, gallery.Id));
 }
 public static MvcHtmlString GalleryPicture(this HtmlHelper helper, Gallery gallery) {
     return helper.GalleryPicture(gallery, PictureSize.Large);
 }