NHibernate - dirty ISession not updating

When the save button is clicked, the following code is run [PersistenceSession is a property returning an ISession instance]:

_storedWill = PersistenceSession.Load<StoredWill&g开发者_JAVA技巧t;(_storedWillId);
_storedWill.WillReference = txtWillReference.Text;
_storedWill.IntroducerReference = txtIntroducerReference.Text;
//A stack of other properties of the _storedWill object assigned
PersistenceSession.SaveOrUpdate(_storedWill);

A breakpoint set on the final line reveals that PersistenceSession.IsDirty() is true.

However, no update SQL is generated. Can anyone think why?

Thanks

David

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You need to Flush the session to have the updates sent to the database. SaveOrUpdate will not send anything to the database unless you are persisting a newly-created entity, whose ID values are database generated. Since you are just updating, all this does is ensures that the _storedWill entity is associated with the ISession returned by the PersistenceSession property.