public static Bundle AddCssBundle(this BundleCollection bundles, string virtualPath, string cdnpath = "") { var result = bundles.FirstOrDefault(b => string.Compare(b.Path, virtualPath, StringComparison.OrdinalIgnoreCase) == 0); if (result != null) { return(result); } if (!string.IsNullOrEmpty(cdnpath)) { return(new StyleBundle(virtualPath, cdnpath)); } return(new StyleBundle(virtualPath)); }