Enum radio button list in Asp.Net MVC

public static partial class MyEnumRadioButtonList
{
    #region Enum Radio Button List

    public static MvcHtmlString EnumRadioButtonListFor<TModel, TEnum>(this HtmlHelper<TModel> htmlHelper,
        Expression<Func<TModel, TEnum>> expression)
    {
        return EnumRadioButtonListFor(htmlHelper, expression, null);
    }

    public static MvcHtmlString EnumRadioButtonListFor<TModel, TEnum>(this HtmlHelper<TModel> htmlHelper,
        Expression<Func<TModel, TEnum>> expression, object htmlAttributes)
    {
        ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
        Type enumType = GetNonNullableModelType(metadata);
        IEnumerable<TEnum> values = Enum.GetValues(enumType).Cast<TEnum>();
        string fullName = ExpressionHelper.GetExpressionText(expression);

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

        var sb = new StringBuilder();

        foreach (var item in items)
        {
            // Generate an id to be given to the radio button field 
            var id = string.Format("rbl_{0}_{1}",
                                    fullName.Replace("[", "").Replace("]", "").Replace(".", "_"),
                                    item.Value);

            // Create and populate a radio button using the existing html helpers 
            var label = htmlHelper.Label(id, HttpUtility.HtmlEncode(item.Text));
            //var radio = htmlHelper.RadioButtonFor(expression, item.Value, new { id = id }).ToHtmlString();
            var radio = htmlHelper.RadioButton(fullName, item.Value, item.Selected, new { id = id }).ToHtmlString();

            // Create the html string that will be returned to the client 
            // e.g. <input data-val="true" data-val-required=
            //   "You must select an option" id="TestRadio_1" 
            //    name="TestRadio" type="radio" value="1" /><label for="TestRadio_1">Line1</label> 
            //sb.AppendFormat("<{2} class=\"radiobuttonlist\">{0}{1}</{2}>",
            //   radio, label, (position == Position.Horizontal ? "span" : "div"));

            sb.AppendFormat("{0}{1}", radio, label);
        }

        return MvcHtmlString.Create(string.Format("{0}{1}{2}",
                        "<span class='radiobuttonlist'>", sb.ToString(), "</span>"));
    }

    #endregion
}