Itemupdating change

Add-in events are also handled by remote web services, but they are configured differently in the add-in package from list and list item RERs, so they are treated as a separate category of component.

In fact, it is a best practice to catch any errors in your handler and instruct Share Point to roll back the installation.Share Point cannot delete these things, or move them to the recycle bin, because it doesn't know about them, at least not as components of the add-in.It is usually a good practice to remove these things.Two more steps are required before the App Uninstalling event is triggered.First, a user must remove the add-in from the recycle bin, which moves it to the second stage recycle bin.

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