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    <p>First to say Entity Framework implements a Repository pattern and a Unit of Work Pattern. Implementing Repository and Unit of Work patterns on top of a modern ORM like Entity framework is an additional layer of abstraction that:</p> <ul> <li>narrows the possibilities of the underlying ORM </li> <li>does not provide additional value to the underlying ORM</li> <li>is at best worthless but may be harmful </li> </ul> <p>One purpose of such implementations is to encapsulate the query logic in the Repository and not one query like Single Responsibility Principle (<a href="http://en.wikipedia.org/wiki/Single_responsibility_principle" rel="nofollow">SRP</a>) would suggest, but a couple of queries and thus violating SRP. What you could do is to rely on your ORM and encapsulate extensive query logic in single Query classes.</p> <p>My suggestion is not to please "best practices" by adding abstraction layers on abstraction layers and so on but to try to solve a problem using some more general design guidelines such as <a href="http://en.wikipedia.org/wiki/SOLID_%28object-oriented_design%29" rel="nofollow">SOLID</a>.</p> <p>Ayende Rahien reviews the Northwind Starter Kit application in a series of blog posts (<a href="http://ayende.com/blog/153059/northwind-starter-kit-review-if-you-wonrsquo-t-respect-the-database-there-will-be-pain" rel="nofollow">here</a>, <a href="http://ayende.com/blog/153699/ask-ayende-repository-for-abstracting-multiple-data-sources" rel="nofollow">here</a>, <a href="http://ayende.com/blog/153153/northwind-starter-kit-review-refactoring-to-an-actual-read-model" rel="nofollow">here</a>, <a href="http://ayende.com/blog/153058/northwind-starter-kit-review-data-access-review-thoughts" rel="nofollow">here</a>, <a href="http://ayende.com/blog/153057/northwind-starter-kit-review-the-parents-have-eaten-sour-grapes-and-the-childrenrsquo-s-teeth-are-set-on-edge" rel="nofollow">here</a>, <a href="http://ayende.com/blog/153029/northwind-starter-kit-review-data-access-and-the-essence-of-needless-work-part-ii" rel="nofollow">here</a>, <a href="http://ayende.com/blog/153028/northwind-starter-kit-review-data-access-and-the-essence-of-needless-work-part-i" rel="nofollow">here</a> and <a href="http://ayende.com/blog/152706/application-review-northwind-starter-kit" rel="nofollow">here</a>) in <a href="http://ayende.com/blog" rel="nofollow">his blog</a> that deal with so called best practices applied in an application. This is a great read!</p>
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    1. POASP.NET MVC 3 best practice / design
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    1. COThanks I will check out the blog. It really comes down to understanding when to use a best practice/ pattern and why.
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    2. CO-1 for repository pattern being "worthless" when used with "modern ORM"
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    3. COThe statement "is at best worthless but may be harmful" has to be seen in context of implementing a Repository pattern AND Unit of Work pattern on top of Entity Framework...
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