public static SyndicationLink GetPreviousPageLink(this SyndicationFeed feed, bool throwIfNotPresent) { if (feed == null) { throw new ArgumentNullException("feed"); } SyndicationLink prevPageLink = feed.Links.Where((link) =>(link.RelationshipType == "previous")).SingleOrDefault(); return prevPageLink; } public static SyndicationLink GetSelfLink(this SyndicationFeed feed, bool throwIfNotPresent)