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Use the FormViewUpdatedEventArgs.Exception property to determine the exception (if any) that was raised during the update 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 FormViewUpdatedEventArgs.ExceptionHandled property to true; otherwise, the exception is thrown again by the System.Web.UI.WebControls.FormView control.