Learning ADO.NET
http://msdn2.microsoft.com/en-us/data/aa937699.aspx
Learning Microsoft Data Access Components (MDAC)
http://msdn2.microsoft.com/en-us/data/aa937703.aspx
Learning SQL Native Client
http://msdn2.microsoft.com/en-us/data/aa937705.aspx
Usage Scenarios for SQL Server 2005 Native Web Services
http://msdn2.microsoft.com/en-us/library/ms345140.aspx
How to Use the ODBC.NET Managed Provider in Visual Basic.NET and Connection Strings
http://support.microsoft.com/kb/310985/
How to Use the ODBC.NET Managed Provider in C# .NET and Connection Strings
http://support.microsoft.com/kb/310988
SQL Server OLE DB Programmer's Reference
http://msdn2.microsoft.com/en-us/library/aa198360(SQL.80).aspx