Raise an event of a class from a different class in C#

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This is not possible, Events can only be risen from inside the class. If you could do that, it would defeat the purpose of events (being able to rise status changes from inside the class). I think you are misunderstanding the function of events – an event is defined inside a class and others can subscribe to it by doing

obj.AfterSearch += handler; (where handler is a method according to the signature of AfterSearch). One is able to subscribe to the event from the outside just fine, but it can only be risen from inside the class defining it.

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