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It appears as though they are firing twice in this situation because Share Point is updating the properties on the document and then checking it in on the same request.If you were to check the document out and edit the properties on the document, you would see the Item Updating and Item Updated events fire once.Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Visit Stack Exchange The reason why item-updating event receiver fires twice in case of document libraries is because of check-in/checkout.I am nothing if not a masterful linguist after a beer or two or more.
For example, if you define an instance level variable in the class to store data in the Item Updating event, then try to access that data in the Item Updated event, you will find that the data is not there when you go to check it in the Item Updated event.
If not, kudos to you for tackling the object model with reckless abandon.
Sometimes that is the most exciting way to learn, but for those less adventurous I will briefly cover the topic here.
Unfortunately, that makes your project like the Titanic.
I don’t mean that it’s largest and most luxurious application every written, but rather that you may be cruising headlong into a nasty rendezvous with an iceberg that could deal a severe blow to your project.
Dangers lurk hidden out there which, if you run into them, can be a blow to your project and waste a great deal of time.