Detailsview fired event itemupdating
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.I should also point out that I know the difference between a metaphor and simile in case that was bothering you from the opening sentence.
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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 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.
You can think of an item event receiver like a database trigger: it has different events that fire during the course of Share Point running an operation on a list item (or document item).
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.