Raises the LongitudeChanged event.
Raising an event invokes the event handler through a delegate. The OnLongitudeChanged 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 OnLongitudeChanged in a derived class, be sure to call the base class's OnLongitudeChanged method so that registered delegates receive the event.