I understand that interfaces are contracts and any changes (even additions) break any dependent code. However, I could have sworn I read something a while back that one of the recent .NET versions (3, 3.5??) added a new attribute that could be applied to new interface members. This attribute allowed versioning and/or making members optional. It would have been something like:

interface ITest
{
    void MethodOne();

    [InterfaceVersion(2)]
    void MethodTwo();
}

I have looked high and low for this but just can't seem to find it. I am wondering whether I simply misunderstood whatever I think I read and there is no such thing. Does someone have any insight?

c# interface versioning
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