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ItemUpdating Cancel ErrorMessage not shown on Standard SharePoint Error Page

Posted By:      Posted Date: September 02, 2010    Points: 0   Category :SharePoint
I have created an ItemUpdating event handler on a document library, the event is cancelled in certain scenarios by executing the following code in the event handler properties.Cancel = true; properties.Status =   SPEventReceiverStatus.CancelWithError; properties.ErrorMessage =   "ADV number entered is not unique. Please try again"; The standard Sharepoint error message is shown but the error message set above is not displayed. Can somebody help?      

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