public ActionResult DefaultCss()
        {
            var content = string.Empty;

            Bundles.Reference("Default-css");
            foreach (var url in Bundles.GetReferencedBundleUrls <StylesheetBundle>())
            {
                var response = WebRequest.Create(N2.Web.Url.ServerUrl + url).GetResponse();
                using (var sr = new StreamReader(response.GetResponseStream()))
                {
                    content += sr.ReadToEnd();
                }
            }
            return(Content(content, "text/css"));
        }