SharePoint: Unique column values

Posted by Anoop on Stack Overflow See other posts from Stack Overflow or by Anoop
Published on 2010-03-17T13:09:46Z Indexed on 2010/03/17 13:11 UTC
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column

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unique

I Want to have only unique values in a SharePoin List. To achieve this I can use 'ItemAdding' event handler as mentioned in the below link.

http://weblogs.asp.net/vikram/archive/2008/12/24/sharepoint-using-event-handler-to-make-a-column-unique.aspx

Now I have a Doubt: Suppose that two user tries to add list Item in the list with the same column value(which requires unique value) at the same Time. will ItemAdding event would be fired at the same time for both call? If so then there is a possibility that two items having same value in the column. Please confirm.

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