I had a problem with this validation provider when using Entity Framework Code First objects as MVC models. The problem was that in actions such as Create, the navigational properties for associated objects were null (as in Vehicle -> Driver; Driver was null when creating a Vehicle). The problem was that the provider examined every property and returned validation errors on such properties. I modified the code to only validate the model and not the properties, like this: public class EnterpriseLibraryValidationProvider : ModelValidatorProvider { public override IEnumerable<ModelValidator> GetValidators( ModelMetadata metadata, ControllerContext context) { if (metadata.ContainerType == null || String.IsNullOrEmpty(metadata.PropertyName)) { var validatorFactory = IocContainer.Instance.Unity.Resolve<ValidatorFactory>(); Validator validator = validatorFactory.CreateValidator(metadata.ModelType); if (validator != null) return new[] { new EnterpriseLibraryValidationWrapper(metadata, context, validator) }; } return Enumerable.Empty<ModelValidator>(); } }

Mikekelly85 is right, you should have mentioned HTTP Digest.