When an exception is raised during the delete operation, use the GridViewDeletedEventArgs.ExceptionHandled property to indicate whether the exception was handled in the event handler. When this property is set to true, the exception is considered handled and is not re-thrown. If this property is set to false, the System.Web.UI.WebControls.GridView control re-throws the exception. To determine which exception was raised, use the GridViewDeletedEventArgs.Exception property.