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

It seems that you have some design problems. I think that it would be better to redesign your code like:

class Visitor
{
    private bool isSubscriber = false;

    public bool IsSubscriber
    {
         get { return isSubscriber; }
    }

    public void Subscribe()
    {
        // do some subscribing stuff
        isSubscriber = true;
    }

    public void Unsubscribe()
    {
        // do some unsubscribing stuff
        isSubscriber = false;
    }
}