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Why is setting a delegate to null required?

I am pulling bits and pieces from this tutorial and I got this code that works:

                ImageMapDelegate mapDelegate = new ImageMapDelegate();

                ThreadJourneyMap.Delegate = null;
                ThreadJourneyMap.Delegate = mapDelegate;

But if I remove the

ThreadJourneyMap.Delegate = null;

I get a "Event registration is overwriting existing delegate..." error. Whats up with that?


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