I hope you have gone
through the Part 1 to 3 of C# events.
C# Events – NullReferenceException –
If you raise an event
without handlers then you get this exception – Object reference not set to
instance of an object. Look below screenshot. I have commented the registration
of event from Fielder class and similarly for Fan class. Also commented null
check from Ball class from event raising code –
The exception is reported
because none of the objects have added their event handlers to an event
BallInGround, hence it will be null. Therefore it is always necessary to check
null condition before raising an event.
