public AddInId ActiveAddInId { get; }

Public ReadOnly Property ActiveAddInId As AddInId
	Get

public:
property AddInId^ ActiveAddInId {
	AddInId^ get ();
}

The application can be either a UI application, DB application, or an external command. If no addin is active, this property will return nullNothingnullptra null reference (Nothing in Visual Basic). If an event handler is currently being executed, the returned value will be the Id of the application or command in which the event handler was registered.