If I attempt to fill a BO and the critera I used returns zero records.... how do I handle that gracefully? Right now I get an error: "Cannont convert "" to integer".



Thanks

Is there a way I can cancel the ListPopulating event if my primary business object returned zero rows?

All you need to do is attempt to populate before you call the Requery method of the ListView.  This way the ListPopulating event will never even be called and the list will not attempt to re-populate.  One thing that you will probably want to do is set the PopulateOnFormLoad to manual which means the list will not populate unless you call the Requery method of the ListVIew.