Public Event CollectionChanged As NotifyCollectionChangedEventHandler

Dim instance As UXCalendarSelectedDatesCollection
Dim handler As NotifyCollectionChangedEventHandler
 
AddHandler instance.CollectionChanged, handler

public event NotifyCollectionChangedEventHandler CollectionChanged

public event CollectionChanged: NotifyCollectionChangedEventHandler; 

In JScript, you can handle the events defined by another class, but you cannot define your own.

public: __event NotifyCollectionChangedEventHandler* CollectionChanged

public:
event NotifyCollectionChangedEventHandler^ CollectionChanged