C#: Method to return object whose concrete type is determined at runtime?

Question

I\'m thinking about designing a method that would return an object that implements an interface but whose concrete type won\'t be know until run-time. For example suppose:

Answer 1

A better solution would have ICar declare a GenericCarMethod() and have Bmw and Toyota override it. In general, it's not a good design practice to rely on downcasting if you can avoid it.