Can I add MVC's Required Attribute to a class defined elsewhere by inheriting the class?

I have a bunch o开发者_StackOverflow中文版f classes generated from my EntityFramework based DAL. I don't want to modify those classes directly in case I regenerate them from the database, but I want to be able to specify certain fields are [Required]. I thought about making another class that inherited from my data object and add the attribute to the new class's field, but then I have to hide the base class's property. Is there a good/easy way to do this without worrying about losing my manual changes on regeneration, and without rewriting the objects entirely?

Thanks

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you can define your models as partial classes and specify metadata else where.

ex:

[MetadataType(typeof(UserMetaData))]
public partial class User
{
    public string Name { get; set; }
}

public class UserMetaData
{
    [Required]
    public string Name;
}