Incremental Validation in WPF

How do you ensure that developers using your business objects also incorporate the necessary validation code to guarantee that only good data is passed to your class' property? I've looked at the three interfaces that allow you to incorporate validation code into your class while integrating with an application's user interface, and Data Annotations which allow you to separate your validation code from your class. WPF includes another option that allows developers to incrementally add validation rules to their UIs.

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