Sitecore Enum Driven Dropdownlist. Uses [Description] attribute if defined.

EnumList

using System;
using System.ComponentModel;
using Sitecore.Web.UI.HtmlControls;

namespace DetangledDigital.Sc.FieldTypes
{
    /*
    * 
    * @CGaskell
    * Custom field type. Renders a dropdown list based on a specified enum.
    * The code will look for the 'Description' attribute on the enum item and render
    * that as the display if it's available. Enum value will be used as dropdown value.
    * 
    * Inspiration from http://www.partechit.nl/en/blog/2013/01/using-an-enumeration-as-data-source
    *
    */
    public class EnumList : Combobox
    {
        public string Source { get; set; }

        protected override void OnLoad(EventArgs e)
        {
            if (Controls.Count != 0 || string.IsNullOrWhiteSpace(Source))
                return;

            try
            {
                var enumType = Type.GetType(Source);
                if (enumType == null) return;

                foreach (Enum val in Enum.GetValues(enumType))
                {
                    Controls.Add(new ListItem
                    {
                        ID = val.ToString(),
                        Header = GetDescription(val) ?? val.ToString(),
                        Value = val.ToString()
                    });
                }
            }
            catch
            {
                Controls.Add(new ListItem {Header = "Could not load enum for " + Source});
                return;
            }

            base.OnLoad(e);
        }

        public static string GetDescription(Enum value)
        {
            var type = value.GetType();

            var name = Enum.GetName(type, value);
            if (name == null) return null;

            var field = type.GetField(name);
            if (field == null) return null;

            var attr = Attribute.GetCustomAttribute(field, typeof (DescriptionAttribute)) as DescriptionAttribute;

            return attr != null
                ? attr.Description
                : null;
        }
    }
}

Thanks! This is super helpful.

One improvement suggestion, change the ID of the ListItem to "this.ID + val.ToString()" so that the id is unique. This can prevent error "Field control has failed to render: Multiple controls with the same ID" in "Reset Field Values" form (Content Editor -> Banner "Version" tab -> "Reset" button)