How .NET framework handles ambiguity methods in multiple inheritance. As in ASP.NET MVC we can handle action ambiguity by [actionname] dataannotation.

In C#, two classes (either abstract or concrete) cannot be inherited by the same 
derived class. It causes ambiguity in the derived class if both have the same method 
signature. But in asp.net mvc we can use two action with same name by decorating with 
the data annotation attribute [ActionName]. I want to know how both these things are 
different. how .NET framework identifies these situation, want to know the real oops concept used behind this.