Source. On Position Changed(EventArgs) Method
Raises the PositionChanged event.
protected: virtual void OnPositionChanged(EventArgs ^ e);
protected virtual void OnPositionChanged (EventArgs e);
abstract member OnPositionChanged : EventArgs -> unit override this.OnPositionChanged : EventArgs -> unit
Protected Overridable Sub OnPositionChanged (e As EventArgs)
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The OnPositionChanged 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.