Gary,

>What I should be doing to not have datasession leftovers properly clean up my instantiated bizobj classes?

>Also, does using this.addobject() add any automatic house keeping of benefit or is direct instantiation in code just as good?

If you're dropping business objects on the form at design time and not cross-registering any objects with each other, then the Framework can handle the cleanup for you. If you've dynamically added a business object to the form, and are holding references to it in one or more additional places, you'll want to make sure you clear those references and manually release the business object by calling its Release() method. You might want to look closer at the forms in which this is occurring and see if you're doing any of these things.

Regards,