Question

What is the difference between SaveOrUpdateCopy and SaveOrUpdate method in NHibernate?

Answer 1

From nHibernate doc:

Copy the state of the given object
onto the persistent object with the
same identifier. If there is no
persistent instance currently
associated with the session, it will
be loaded. Return the persistent
instance. If the given instance is
unsaved or does not exist in the
database, save it and return it as a
newly persistent instance. Otherwise,
the given instance does not become
associated with the session.

There is one nice blog post on the subject.