Oops, can't believe I missed ADO.NET. For those that don't know, ADO.NET is the next gen of ADO (ActiveX Data Objects, IIRC) that basically gives a consistent interface to talk to databases and other storage/persistence providers.
ADO.NET isn't part of the BCL, but it is part of the .NET Framework. It's basically another framework built on top of the BCL like ASP.NET, Winforms, Web Services, etc.
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