Is there any reason to make POCOs into Model objects?

Validation is the main reason not to bind directly to a POCO. In addition, if the POCO doesn't already implement INotifyPropertyChanged and other required interfaces, the experience working with the object on the WPF side may be less desirable, and implementing a ViewModel to wrap this makes sense.

I disagree only slightly with Reed (an unusual circumstance to be sure). I would NOT implement a ViewModel to wrap the POCO. I would implement a Model class to wrap the POCO and expose the Models to the ViewModel via a Service layer.

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