Raised when a non-fatal event happens that needs reporting.

Raised when the viewer wants to show a particular page that is not in the current page selection.

Raised when an exception occurs that is not handled by the library at a point that is not invoked by user code (e.g. during an OnPaint event).

Raised after the VisibleRectangle has changed.

Raised after the ZoomFactor has changed. You typically handle this event to update the UI of your reader, such as e.g. a tool bar.