private void OptionMenuAction(String sender) { switch (sender) { case "next": var nextList = dataAccess.GetBible(BibleDataAccess.Mode.Next); if (nextList != null) { var next = new ObservableCollection <Bible>(nextList); Bible.Clear(); Bible = next; } break; case "prev": var prevList = dataAccess.GetBible(BibleDataAccess.Mode.Prev); if (prevList != null) { var prev = new ObservableCollection <Bible>(prevList); Bible.Clear(); Bible = prev; } break; case "note": break; case "sermon": break; } }