protected override void OnEnabledChanged(EventArgs e)

Protected Overrides Sub OnEnabledChanged(e As EventArgs)

Raising an event invokes the event handler through a delegate.

The OnEnabledChanged method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors:

When overriding OnEnabledChanged in a derived class, be sure to call the base class's OnEnabledChanged method so that registered delegates receive the event.