What are data source controls?

Data source controls have no rendering, but instead represent a particular backend data store, for example a database, business object, XML file, or XML Web Service. Data source controls also enable rich capabilities over data - such as sorting, paging, filtering, updating, deleting, and inserting - that data-bound UI controls can automatically use. ASP.NET includes the following server controls out-of-the-box:
SqlDataSource Enables binding to a SQL database represented by an ADO.NET provider, such as Microsoft™ SQL Server, OLEDB, ODBC, or Oracle.
ObjectDataSource Enables binding to a middle-tier object such as a data access layer or business component.
AccessDataSource Enables binding to a Microsoft™ Access (Jet) database.
SiteMapDataSource Enables binding to the hierarchy exposed by an ASP.NET 2.0 site navigation provider.
XmlDataSource Enables binding to an XML file or document.

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