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Hopefully you know about item event receiver if you are having problems with them firing twice.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.With that in mind, Share Point 2010 is like a sea of icebergs – there is a lot going on under the surface that you may not notice until it’s too late.Unfortunately, that makes your project like the Titanic.
To understand why this is happening, let’s first look at what happens when the user adds a document to the library when the Require Check Out option is disabled: So the net result of this is that the document is uploaded and the Item Adding and Item Added events have fired, which is pretty much what you would expect.
A list instance event receiver responds to events that occur in any instance of a list definition.
Although the event receiver template does not enable the targeting of a specific list instance, you can modify an event receiver that is scoped to a list definition to respond to events in a specific list instance.
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.
Sometimes that is the most exciting way to learn, but for those less adventurous I will briefly cover the topic here.