Class/Model Level Validation (as opposed to Property Level)? (ASP.NET MVC 2.0)?

Now that you've looked at Data Annotations and arrived to the conclusion that they are not adapted to your scenario I would suggest you looking at FluentValidation its integration with ASP.NET MVC and the way you would unit test your validation logic - you won't be disappointed (I really have nothing against Data annotations, they are great for blog posts and tutorials but once you are confronted to real world applications you quickly realize the limits).

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