Removes all dynamic entity observations from the in-memory data cache as well as from the map or scene. Sometimes, a large number of dynamic entity observations can crowd the display and make information hard to interpret. Use this method to clear (purge) all dynamic entity observations to remove stale information and limit the amount of memory consumed. This does not disconnect you from the service, so new dynamic entity observations continue to display as they become available.
The following DynamicEntityDataSource events will not be raised due to a call to this method:
A Result that has no return value.