Problem

If you don’t place a ‘not null’ condition before raising an event, you might get a NullReferenceException. That’s why we usually type something like:

event EventHandler MyEvent;

void RaiseMyEvent()
{
    if (MyEvent!= null) MyEvent(this, EventArgs.Empty);
}

Solution

Why not use the following pattern:

event EventHandler MyEvent = delegate { };

void RaiseMyEvent()
{
    MyEvent(this, EventArgs.Empty);
}

This way we can avoid the following:

Raising Events