protected virtual void OnPaint(PaintEventArgs e)

Protected Overridable Sub OnPaint(e As PaintEventArgs)

Raising an event invokes the event handler through a delegate.

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