For starters, try Doug Rothaus and Mike Pizzo, their MSDN article, "ADO.NET for the ADO Programmer" at:

http://msdn.microsoft.com/library/en-us/dndotnet/html/adonetprogmsdn.asp

Paul D. Sheriff was the guy that introduced me to ADO at some hick dive in Orange County, California. He returns with "Using ADO.NET" at MSDN:

http://msdn.microsoft.com/library/en-us/dndotnet/html/usingadonet.asp