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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.This is because you have two classes – one that is handling the Item Updating event and in which the instance level variable is set, and one that is handling the Item Updated event in which the instance level variable is not set.

Fortunately, there is a relatively simple way to check whether the Item Updating and Item Updated events are firing in response to a check-in outlined in Knowledgebase Article 939307.

Next, let’s look at what happens when the user adds a document when the Require Check Out option is enabled.

The first time the Item Updating and Item Updated events fire it is in response to the document properties changing.

If the user opts to cancel, then only the Item Adding and Item Added events will have fired and the document will be left in a checked out state.

Also note: the Item Updating and Item Updated events that fire in response to the properties being edited from the dialog will always occur, even if the user is not entering or changing any of the values.

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