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I will develop a WCF service. The service will get data from SQL Server.
What patterns I should use to separate access code to SQL Server and other code. In future I am planning to change access logic to SQL Server (LINQ to SQL or ADO.NET or Entity Framework).
If you want to be able to replace the data access logic you will have to isolate it from the rest of the application. I think the “Repository” pattern could help.