Called when the topology element selection is changed.
[Visual Basic .NET] Public Event OnTopologySelectionChanged As OnTopologySelectionChangedEventHandler
[C#] public event OnTopologySelectionChangedEventHandler OnTopologySelectionChanged
Available with ArcGIS Desktop.
Whenever the selection of topology elements changes the OnTopologySelectionChanged event is fired. In some cases for a set of topology selections you may want to use ITopologyExtension::DelayEvents to minimize notifications.