public static MvcHtmlString ListBoxSimple <TModel, TProperty>(this HtmlHelper <TModel> htmlHelper, Expression <Func <TModel, TProperty> > expression, IEnumerable <SelectListItem> selectList, string defaultValue, object htmlAttributes) { IEnumerable <SelectListItem> selectDefault = new SelectListItem[] { new SelectListItem { Value = "", Text = defaultValue, Disabled = true } }; selectDefault = selectDefault.Concat(selectList); return(htmlHelper.ListBoxFor(expression, selectDefault, htmlAttributes)); }