Raised when an element is about to be added. The addition of the element can be cancelled through the event arguments.

Raised when an element was removed from this list. The element removed is contained in the event arguments. This event is necessary to be able to retrieve a removed element after it was removed from the list by an observer, as ListChanged only contains indexes, and the index of a removed element isn't valid after it's been removed from the list.

Raised when an element is about to be removed. The removal of the element can be cancelled through the event arguments.

Occurs when the list changes or an item in the list changes.

Raised when this list is about to be cleared completely. The clearing of the list can be cancelled through the event arguments.