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));
}