ItemEvents_10_Event.Close Event

Occurs when the inspector associated with an item (which is an instance of the parent object) is being closed.

Namespace:  Microsoft.Office.Interop.Outlook
Assembly:  Microsoft.Office.Interop.Outlook (in Microsoft.Office.Interop.Outlook.dll)

event ItemEvents_10_CloseEventHandler Close

If you use the Close method to fire this event, it can only be canceled if the Close method uses the olPromptForSave argument.