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So, if we go back to our original problem listed above.

How can we prevent a user from changing a certain column for an item in a list event?

For example, you can hook into the Item Updating event for a document library and prevent a user from changing a certain column.

The code might look like this: When they say “not available for post events on list items”, do they mean after events (like Item Updated, Item Deleted, etc)?

If it returns True, the the List has been throttled (has more items than the List View Throttle limit).

If it returns false, it has either less than the List View Throttle limit or throttling has been disabled via the Enable Throttling property.

The object SPUsage Service Instance was updated by DOMAIN\farmaccount, in the OWSTIMER process, on machine SHAREPOINTSERVERNAME.

View the tracing log for more information about the conflict." Item Added. Well right after you add a new document the Edit Form pops up in order to allow you to change any properties for the document.

I've written an event receiver for that list, here's my code: Use Item Updating event and then afterproperties contains changed value and List Item contains original value of a field.

The events that are fired for this Form after you press Save are: Item Updating Item Updated.

Yet, at this moment (the moment right after you add a new document), the Before Properties has no usefull values like it should. So, not only the Update events are fired, when your are adding a new document (because infact the document is already saved), as the Before Properties work diferently from the standard Update action.

When you're persisting some property running with elevated priveligies, you have to set Allow Unsafe Updates in order to bypass the security validation when you call the Update() method.

Bare i mind that any Exception (handled or otherwise) occur during the execution of your code, for instance: a try catch block, the Allow Unsafe Updates property is setted back to false.




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