Can we have non-proxy POCO's and POCO proxies in the same ObjectContext?

I am going to go out on a limb here and say no, not based on anything other than how most mocking frameworks create dynamic proxies. At runtime the DataContext will create a proxy class inherited from your POCO. If nothing is virtual then it will provide no data support.

I suspect it will notify you of this with an exception, but am not sure.

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