gistfile1.cs

using System;
using System.Linq;

namespace EnumTest
{

    public enum ContentAreaTagEnum
    {
        Unknown,
        [ContentArea(Name = "Full")]	
        Full,
        [ContentArea(Name = "23rd")]
        TwoThirds,
        [ContentArea(Name = "Half")]
        Half
    }

    public class ContentAreaAttribute : Attribute
    {
        public string Name { get; set; }
    }

    public static class EnumExtensions
    {
        public static T GetFirstAttribute<T>(this Enum enumValue) where T : Attribute
        {
            var enumMemberInfo = enumValue.GetType().GetMember(enumValue.ToString());
            var first = enumMemberInfo.FirstOrDefault();
            // ReSharper disable once PossibleNullReferenceException This is only null when someone defines empty. Enum. I don't suspect someone doing such pointless thing.
            var attributes = first.GetCustomAttributes(typeof(T), false);
            return (T)attributes.FirstOrDefault();  // resharper says the left operand is never null. Lib has a type hints.
        }
    }

    public enum Empty{}

    public enum SingleEnum{ X }

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(ContentAreaTagEnum.Full.GetFirstAttribute<ContentAreaAttribute>().Name);
            Console.WriteLine(ContentAreaTagEnum.TwoThirds.GetFirstAttribute<ContentAreaAttribute>().Name);
            Console.WriteLine(ContentAreaTagEnum.Unknown.GetFirstAttribute<ContentAreaAttribute>() == null);
            Console.WriteLine(SingleEnum.X.GetFirstAttribute<ContentAreaAttribute>());
            Empty x = 0;
            Console.WriteLine(x.GetFirstAttribute<ContentAreaAttribute>());
        }
    }
}