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property is set to "Update".) This enables you to perform a custom routine whenever this event occurs, such as canceling the update operation.
A List View Update Event Args object is passed to the event handler, which enables you to determine the index of the current item.
It also lets you indicate that the update operation should be canceled.
To cancel the update operation, set the collections before the values are passed to the data source.
If the name isn’t changed, the changes are saved to the Share Point list.
Before you can deploy the event receiver you have to change the file to bind the Update Adding event receiver to all custom lists.
We may never know about all of the dangers lurking out there, but today we’re going to cover at least one danger you may encounter while writing event receivers – an annoying issue with the Item Updating and Item Updated events firing twice.Instead of writing more paragraphs I can use tabular to explain, I think this will be easy to understand.Each event method has a SPItem Event Properties parameter named properties.the actual Add / Update operation for which the Adding / Updating event is being fired).Do NOT try to manually get the list item in code and update a property on it because the optimistic locking mechanism in Share Point may throw an error later on when the operation associated with the event to which you are responding attempts to complete.