How to change the class of an object dynamically in C#?

Question

Suppose I have a base class named Visitor, and it has 2 subclass Subscriber and NonSubscriber.

At first a visitor is start off from a NonSubscriber, i.e.

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Answer 1

You could use the GOF design patterns State or Strategy to model such an behaviour. Using these patterns, it seems during runtime as if the class of the objects has been changed.