Republished with Permission - Original
Earlier this week the data team released the CTP5 build of the new Entity Framework
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.