Adds a feature class to this map topology. All existing topology elements will become invalid.
[Visual Basic .NET] Public Sub AddClass ( _ ByVal fclass As IFeatureClass _ )
[C#] public void AddClass ( IFeatureClass fclass );
Product Availability
Available with ArcGIS Desktop.
Remarks
Use AddClass to append additional editable feature classes to the map. Only classes that implement ITopologyClass can be added to a MapTopology; you should ensure that a FeatureClass you want to add supports this interface.