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 cant do this type of conversion. What you should do is treat mary as a visitor, and when time arrives, create a new instance of "subscriber":

Visitor mary = new NonSubscriber();
// Do some Visitor operations
...
// Now mary is a Subscriber
mary = new Subscriber();