Where to put common interface methods when dealing with partial classes, inheritance, and Visual Studio Generated Code?

I would use encapsulation in this case. Create a class (with a private instance in both classes), and delegate the SomeMethod call to the internal, private class implementation.

It looks like the TableAdapter classes contained in . NET datasets has a base class that can be changed in teh designer. Is this the class you are using with partial classes, or could you use this as a way to provide a common base class where these methods could go?

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