I use EF Code First for MVC projects. I put business logic in an Infrastructure project. I also use Attributes in the Model/ViewModel for simple validation.

>By the way, do you like to use EF for MVC projects, or do you prefer something else? Also, where do you put your business logic? I'm talking code beyond simple validations. MVC Scaffolding implements a "repository" layer, but I haven't looked into what that really means.
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>Thanks.