public static IPagedDataService<Photo> GetUsrPhotosPagedDataService(Usr usr) { var orderBy = new [] { new KeyValuePair<object, OrderBy.OrderDirection>(Photo.Columns.DateTime, OrderBy.OrderDirection.Descending), new KeyValuePair<object, OrderBy.OrderDirection>(Photo.Columns.K, OrderBy.OrderDirection.Descending) }; return usr.ChildFavouritePhotos(orderBy); }