Raising an event invokes the event handler through a delegate. The OnImageChanged 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 OnImageChanged in a derived class, be sure to call the base class's OnImageChanged method so that registered delegates receive the event.
Do not confuse this with Leadtools.RasterImage.OnChanged(Leadtools.RasterImageChangedEventArgs).