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I have some code in an event receiver in ItemUpdated that checks for duplicates when an item is updated. I would like to if the item already exists after the changes, the updates are not applied. How do I do this?

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properties.Status = SPEventReceiverStatus.CancelWithError;
properties.ErrorMessage = "Custom Error Message";
properties.Cancel = true;

Place these 3 lines in a logical block which needs to stop the execution in the item updating event receiver. It will show the custom error message and stop updating.

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    Thank-you, but this does not work in my solution. It hits this code (I set breakpoints) but nothing is triggered.
    – user3873171
    Sep 9, 2014 at 4:17
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    It should be added in the ItemUpdating event receiver to have any effect.
    – Robert Lindgren
    Sep 9, 2014 at 5:09
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    Yes. Sorry. It should be itemUpdating.
    – Malin De Silva
    Sep 9, 2014 at 5:41

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