I am using WCF and REST, and I have complex types, which are working fine. Now I need to check for validation, I am thinking of using DataAnnotations e.g.

public class Customer
{
   [Required]
   public string FirstName {get;set;}
}

Now where the issue is how do I pass this validation down to the REST service?

ALso I need to validate the object when it comes back, and throw an exception, if I am to throw an exception then what is the best way of doing this using REST?