Class-Level Model Validation with EF Code First and ASP.NET MVC 3
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Published: 10 Dec 2010
Unedited - Community Contributed
In this article, Scott examines the technique involved with class-level model validation with EF Code First and ASP.NET MVC 3. After a short introduction, he demonstrates the usage of IValidatableObject and Automatic Validation Enforcement with the help of relevant source code and screenshots.
by Scott Guthrie
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Republished with Permission - Original Article

Earlier this week the data team released the CTP5 build of the new Entity Framework Code-First library.

In my blog post a few days ago I talked about a few of the improvements introduced with the new CTP5 build.  Automatic support for enforcing DataAnnotation validation attributes on models was one of the improvements I discussed.  It provides a pretty easy way to enable property-level validation logic within your model layer.

You can apply validation attributes like [Required], [Range], and [RegularExpression] – all of which are built-into .NET 4 – to your model classes in order to enforce that the model properties are valid before they are persisted to a database.  You can also create your own custom validation attributes (like this cool [CreditCard] validator) and have them be automatically enforced by EF Code First as well.  This provides a really easy way to validate property values on your models.  I showed some code samples of this in action in my previous post.

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