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Let me start with “What is an Item Event Receiver”Item Event receivers in Microsoft Share Point 2010 enable your custom code to respond when specific actions occur on a Share Point List Item.
Instead of writing more paragraphs I can use tabular to explain, I think this will be easy to understand.
What this means is that you cannot store data in instance-level variables and share that data between event handlers.
For example, if you define an instance level variable in the class to store data in the As per the first look of Developers, we say simply, Item Updating and Item Updated events are fire twice when we adding a document to a document library that has the Require Check Out option enabled.
I am quite new to Share Point and have been working on this thing for a couple of days.
I was able to somehow use Item Added event receiver but I want if I update List 1 then using Item Updated event receiver List 2 should also get updated. How to link items in one list with another and then how to update.
And what i realized is, it fires twice for every newly created subsite.
I checked from Sharepoint Manager if the event receiver is registered twice, but no there are no multiple registrations.
Although asynchronous events expose a SPItem Event Properties parameter named properties just like their synchronous counterparts, remember that the operation has already completed so you cannot modify anything in the properties parameter (well, you can, but it doesn’t do anything).
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Share Point reads these values from the event parameter and modifies the item accordingly when the actual operation runs (e.g.
the actual Add / Update operation for which the Adding / Updating event is being fired).