MSDN:ASP.NET includes data source controls that allow you to work with different types of data sources such as a database, an XML file, or a middle-tier business object. Data source controls connect to and retrieve data from a data source and make it available for other controls to bind to, without requiring code. They can also support modifying data.
MSDN:Gets or sets the ID of the control from which the data-bound control retrieves its list of data items.
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