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A Details View Update Event Args object is passed to the event handler, which allows you to determine the index of the record being updated and to indicate that the update operation should be canceled.To cancel the update operation, set the Cancel property to .
The Item Updating event is raised when an Update button within a Details View control is clicked, but before the update operation.
This allows you to provide an event handler that performs a custom routine, such as canceling the update operation, whenever this event occurs.
If you need to access the original non-key field values, use the Old Values property.
For more information about how to handle events, see Handling and Raising Events.
You can also manipulate the Keys, Old Values, and New Values collections, if necessary, before the values are passed to the data source.