asp.net mvc HtmlHelperExt EnumDropDownList

public static class HtmlHelperExt
    {
        public static MvcHtmlString EnumDropDownList<TEnum>(this HtmlHelper htmlHelper, string name, TEnum selectedValue)
        {
            IEnumerable<TEnum> values = Enum.GetValues(typeof (TEnum))
                .Cast<TEnum>();

            IEnumerable<SelectListItem> items =
                from value in values
                select new SelectListItem
                {
                    Text = value.ToString(),
                    Value = value.ToString(),
                    Selected = (value.Equals(selectedValue))
                };

            return htmlHelper.DropDownList(
                name,
                items
                );
        }

        public static MvcHtmlString EnumDropDownListFor<TModel, TEnum>(this HtmlHelper<TModel> htmlHelper,
            Expression<Func<TModel, TEnum>> expression)
        {
            ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
            IEnumerable<TEnum> values = Enum.GetValues(typeof (TEnum)).Cast<TEnum>();

            IEnumerable<SelectListItem> items =
                values.Select(value => new SelectListItem
                {
                    Text = value.ToString(),
                    Value = value.ToString(),
                    Selected = value.Equals(metadata.Model)
                });

            return htmlHelper.DropDownListFor(
                expression,
                items
                );
        }
    }