Just a couple observations, figured I might as well put them here so I don’t forget.

1. OnCreate May Be Called more than once (Update – I don’t think this is true anymore on 7.5.1)

Specifically, if you are writing an insert page, the OnCreate event of the entity will be called on EVERY POSTBACK.  This surprising behavior just cost me two hours.

2. DataBinding Only Works if an Event is Defined

For example, if you bind to the SelectedValue of a control, but the control does not have a SelectedValueChanged event, the property will never get updated on the entity.