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By default, ASP.NET Web page and control execution is synchronous. However, data source controls can be extended to support asynchronous data retrieval and data operations. The object supports the , , and methods for asynchronous data processing. The delegate is passed to the data source view by a data-bound control, so that the view can call this delegate when asynchronous processing is complete and notify the data-bound control of the operation's outcome.

Represents the asynchronous callback method that a data-bound control supplies to a data source view for asynchronous insert, update, or delete data operations.