Lo,
i've got the collection mapped as <set> in my class and whenever I do the Add(something) method over this collection - the NHibernate insert this object (row) into DB just by oneself (automatically) and the other hand when I force method Clear() over the collection [which remove all objects from collection] the NHibernate doesn't delete this object (row) from the mapped table. So the result is that there in DB is many many rows which should not be there...

I just need to save or update these objects manually in program - by saveOrUpdate() command. Auto update/insert/delete after Add()/Remove() is unwanted. Any idea why this happens to me or how to prevent it?

Thank you very much for your answers.

never heard about automatic persistence in Hibernate. can you post some code?

cheers,
radu

problem was that I didn't close the session...I do session.Close() after each manipulation with persistent objects and everything seems ok now. Thanks a lot.