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 will have to create a new mary = new Subscriber(); and copy all relevant properties.

But a better approach might be to model it differently: Give Visitor a list of subscriptions. An empty list means a NonSubscriber.