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A general software development principle is to suspend or temporarily disable events from firing that you may trigger unintentionally from your code.

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If not, kudos to you for tackling the object model with reckless abandon.

Item Event Receivers derive from the SPItem Event Receiver class and have a number of methods that can be overridden to respond to various events: As you look through this list, you should notice that events have two types of endings: WARNING: One major gotcha you should know about the SPItem Event Receiver class is that while you can implement multiple list item event handlers in a single class, Share Point instantiates a new instance of that class for each individual event it needs to handle.

What this means is that you cannot store data in instance-level variables and share that data between event handlers.

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.

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