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This is a delegate for an event in the corresponding object. After implementing a callback method for the event, use this delegate to connect the callback method to the event. If there are multiple versions of the event interface, this delegate connects the callback method for the event in the specified version of Outlook.
Assembly: Microsoft.Office.Interop.Outlook (in Microsoft.Office.Interop.Outlook.dll)
[ComVisibleAttribute(false)] public delegate void ItemEvents_10_BeforeAttachmentAddEventHandler( Attachment Attachment, out bool Cancel )