namespace System.Web.Mvc { using System.Collections.Generic; using System.ComponentModel.DataAnnotations; public class RequiredAttributeAdapter : DataAnnotationsModelValidator { public RequiredAttributeAdapter(ModelMetadata metadata, ControllerContext context, RequiredAttribute attribute) : base(metadata, context, attribute) { } public override IEnumerable GetClientValidationRules() { return new[] { new ModelClientValidationRequiredRule(ErrorMessage) }; } } }