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The essence of the problem is, given a class hierarchy like this: class A { protected void MethodToExpose() {} protected void MethodToHide(object param) {} } class B : A { new private void MethodToHide(object param) {} protected void NewMethodInB() {} } class C : B { public void DoSomething() { base.MethodToHide("the parameter"); // This still calls A.MethodToHide() base.MethodToExpose(); // This calls A.MethodToExpose(), but that's ok base.NewMethodInB(); } } How can I prevent any classes that inherit from class "B" from seeing the method A.MethodToHide() ? In C++, this was easy enough by using a declaration such as class B : private A , but this syntax is not valid in C#. For those interested (or wondering what I'm really trying to do), what we're trying to do is create a wrapper for for Rhino.Commons.NHRepository that hides the methods we don't want to expose to our group of developers, so we can have a cookie-cutter way of developing our app that new developers can easily follow. So yes, I believe the "Is-A" test is valid for the whole chain (WidgetRepository Is-A BaseRepository Is-A NHRepository). Edit : I should have mentioned, for the sake of argument, that class A is an API class outside of our control. Otherwise the problem gets considerably easier.

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