using System;

using System.ComponentModel.DataAnnotations;

using System.Linq;

using System.Reflection;

​

 public enum CreditCardType

    {

        [Display(Name = "American Express")]

        ax,

        [Display(Name = "Visa")]

        vi,

        [Display(Name = "MasterCard")]

        mc,

        [Display(Name = "Discover")]

        di

    }

 public static class EnumExtensions

  {

    public static string GetDisplayName(this Enum enumValue)

    {

      return enumValue.GetType()

        .GetMember(enumValue.ToString())

        .First()

        .GetCustomAttribute<DisplayAttribute>()

         ?.GetName();

    }

  }

​

public class Program

{

    public static void Main()

    {

       var testOption = CreditCardType.ax;

        Console.WriteLine(testOption.GetDisplayName());

    }

}