private void ResetTrackbacks(Id collId, AppService appSvc)
 {
   if (collId == null) return;
   var bcoll = new BlogAppCollection(appSvc.GetCollection(collId));
   //get old value
   bool? on = bcoll.GetBooleanProperty(Atom.SvcNs + "tracbacksWereOn");
   bcoll.TrackbacksOn = on.HasValue ? on.Value : true;
   bcoll.SetBooleanProperty(Atom.SvcNs + "tracbacksWereOn", null);
 }
 private void TurnOffTrackbacks(Id collId, AppService appSvc)
 {
   if (collId == null) return;
   var bcoll = new BlogAppCollection(appSvc.GetCollection(collId));
   //store old value
   bcoll.SetBooleanProperty(Atom.SvcNs + "tracbacksWereOn", bcoll.TrackbacksOn);
   bcoll.TrackbacksOn = false;
 }