ADO.NET 3.5 Cookbook: Building Data-Centric .NET Applications (Cookbooks (O'Reilly))

ADO.NET in a Nutshell (In a Nutshell (O'Reilly))

LINQ Pocket Reference (Pocket Reference (O'Reilly))

Programming Entity Framework

SQL Antipatterns: Avoiding the Pitfalls of Database Programming (Pragmatic Programmers)

Microsoft ADO.NET 4 Step by Step (Step by Step Developer)