ASP.NET MVC - Creating a SelectListItem with the disabled="disabled"attribute

<option disabled="disabled">don't click this</option>

public class CustomSelectItem : SelectListItem
{
    public bool Enabled { get; set; }
}

public static class CustomHtmlHelpers
{
    public static MvcHtmlString MyDropDownList(this HtmlHelper html, IEnumerable<CustomSelectItem> selectList)
    {
        var selectDoc = XDocument.Parse(html.DropDownList("", (IEnumerable<SelectListItem>)selectList).ToString());

        var options = from XElement el in selectDoc.Element("select").Descendants()
                                    select el;

        foreach (var item in options)
        {
            var itemValue = item.Attribute("value");
            if (!selectList.Where(x => x.Value == itemValue.Value).Single().Enabled)
                item.SetAttributeValue("disabled", "disabled");
        }

        // rebuild the control, resetting the options with the ones you modified
        selectDoc.Root.ReplaceNodes(options.ToArray());
        return MvcHtmlString.Create(selectDoc.ToString());
    }
}