What should I return from an NHibernate Event Listener?

I've wondered about this too and was unable to find a definitive answer. So I pulled down the 2.1.1.GA source code and found the answer: returning true from OnPreInsert, OnPreUpdate, or OnPreDelete will veto (i.e. Cancel) the respective insert, update, or delete operation.

The remainder of the "Pre" listeners return void.

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