Hi,
Dispose is inherited from
IDisposable.
>> In an Office Addin must call remove and dispose on the SmartTagCollection before shutdown?<<
Dispose method is used to Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources. Unmanaged resources could not be released by GC, so we should release it explicitly.
Based on your description, I think the Dispose method had already been called by the Framework before shutting down.
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