static public MvcHtmlString DropDownListBuilder <TModel, TProperty>(this HtmlHelper <TModel> helper,
Expression <Func <TModel, TProperty> > expression, IEnumerable <SelectListItem> selectList, string labelText, bool optionalBlank = false)
{
var div = new TagBuilder("div");
div.MergeAttribute("class", "form-group");
if (optionalBlank)
{
var xBlank = new SelectListItem()
{
Value = string.Empty, Text = string.Empty
};
selectList = xBlank.ToEnumerable().Concat(selectList).OrderBy(o => o.Value);
}
var label = helper.LabelFor(expression, labelText).ToHtmlString();
var input = helper.DropDownListFor(expression, selectList, new { @class = "form-control" }).ToHtmlString();
return(MvcHtmlString.Create(div.ToString(TagRenderMode.StartTag) + label + input + div.ToString(TagRenderMode.EndTag)));
}