Either ErrorMessageString or ErrorMessageResourceName must be set, but not both error using CreditCardAttribute

Question

This is my model:

namespace MvcApplication2.Models
{
    public class CreditCard
    {
        [CreditCard(ErrorMessageResourceType = typeof(Messages), Error         


        

Answer 1

It's a known issue in .Net 4.5. Adding "ErrorMessage = null" named parameter should solve this.

Reference: Reference link is broken now. http://connect.microsoft.com/VisualStudio/feedback/details/757298/emailaddress-attribute-is-unable-to-load-error-message-from-resource-mvc

Answer 2

[CreditCard(ErrorMessageResourceType = typeof(Messages), ErrorMessageResourceName = "CardNumberInvalid", ErrorMessage = null)]

Adding the ErrorMessage = null will fix your problem.