Creating a class level validation attribute ASP.Net MVC

gistfile1.cs

[EndDateValidation]
    public class CustomDate
    {
        [DisplayFormat(DataFormatString = "0:dd-MM-yyyy}")]
        public DateTime StartDate { get; set; }


        public DateTime EndDate { get; set; }
        [Required]
        public string Test { get; set; }
    }


 [AttributeUsage(AttributeTargets.Property|AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
    public sealed class EndDateValidationAttribute : ValidationAttribute
    {


        public override bool IsValid(object value)
        {
            CustomDate date = value as CustomDate;
       

          return date.EndDate > date.StartDate ? true : false;
        }
    }




 public class CustomDateBinder : DefaultModelBinder
    {
        //
        // GET: /CustomDateBinder/


        protected override void OnModelUpdated(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            //base.OnModelUpdated(controllerContext, bindingContext);
            IDataErrorInfo errorProvider = bindingContext.Model as IDataErrorInfo;
            if (errorProvider != null)
            {
                string errorText = errorProvider.Error;
                if (!String.IsNullOrEmpty(errorText))
                {
                    bindingContext.ModelState.AddModelError(bindingContext.ModelName, errorText);
                }
            }


            foreach (ModelValidator validator in bindingContext.ModelMetadata.GetValidators(controllerContext))
            {
                foreach (ModelValidationResult validationResult in validator.Validate(null))
                {
                    bindingContext.ModelState.AddModelError(CreateSubPropertyName(bindingContext.ModelName, validationResult.MemberName), validationResult.Message);
                }
            }


        }


    }
    
    
    public ActionResult TestValidator()
        {
            return View();
        }
        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult TestValidator([ModelBinder(typeof(CustomDateBinder))]CustomDate date)
        {
            return View();
        }