ADO.NET: class library contains a comprehensive framework for building applications that need to retrieve and update data held in a relational database.
Data provider
The NorthWind database
Download from:
http://msftdbprodsamples.codeplex.com/
http://www.microsoft.com/downloads/en/details.aspx?FamilyId=06616212-0356-46A0-8DA2-EEBC53A68034&displaylang=en