When the DetailsView control is in edit mode, use the UpdateItem method to programmatically update the current record in the data source. This method is commonly used when you need to update the current record from outside of the DetailsView control, such as from a different control on the page.
The DetailsView control must be in edit mode when this method is called; otherwise, an HttpException exception is thrown.
To specify whether page validation is performed before the update operation, use the causesValidation parameter. Calling this method also raises the ItemUpdated and ItemUpdating events.