Martin, if you've retrieved the data in the middle tier, how have you transferred the data to the UI layer? I assume you've passed an entity/object... but you've also lost the DataContext along the way. That's my point. 2-tier has change tracking. Multi-tier loses change tracking unless you've got change tracking *at the entity/object level*, since that's all you're passing between layers.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
