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Use the FormViewDeletedEventArgs.Exception property to determine the exception (if any) that was raised during the delete operation. If no exceptions were raised, this property returns null.
If an exception was raised and you decide to handle the exception in the event handler, be sure to set the FormViewDeletedEventArgs.ExceptionHandled property to true; otherwise, the System.Web.UI.WebControls.FormView control re-throws the exception.