... out the fact that as of .NET 4. 0, LINQ to Entities will be the recommended data access solution for LINQ to relational scenarios “ http://blogs.msdn.com/adonet/archive/ 200 8 / 10 / 31/ clarifying -the- message- ... in the client profile framework, so right-click on the Chapter7 .WCFWebServiceHost project, select Properties on the context menu, and change the target framework to .NET Framework 4. 0. 4. ... please see the blog post by Damien Guard (who works at Microsoft within the data programmability team) at http://damieng.com/blog/ 200 9 /06 / 01 / linq-to-sql-changes-in -net- 40 . Why Use EF? The sections...