>I have a textbox which is bound to a field on an entity. I need to run some code whenever the entity's field changes. I've tried calling my code in the textbox's Text_Changed event, but referring to the entity's field at this point in time does not reflect the value entered in the textbox.
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>At what point in time would the entity's field get updated with the value entered in the textbox?
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>Or is there another way to trap/raise an event when the entity's filed changes?

Usually, the UI field is bound to a property that implements INotifyPropertyChanged. You can process your code changes there when the properties value changes. Or trap the PropertyChanged event in the UI and fire off your code there..