public NavigateEntryTask(Feed feed, int entryIndex, List<SyndicationItem> encounteredItems)
 {
     this.feed = feed;
     this.entryIndex = entryIndex;
     this.encounteredItems = encounteredItems;
 }
 public NavigatePreviousArchiveTask(Feed feed, List<SyndicationItem> encounteredItems)
 {
     this.feed = feed;
     this.encounteredItems = encounteredItems;
 }