public ModalBuilder <TModel> Begin(Modal.Modal modal)
        {
            if (modal == null)
            {
                throw new ArgumentNullException(nameof(modal));
            }

            return(new ModalBuilder <TModel>(_helper, modal));
        }
 internal ModalBuilder(HtmlHelper <TModel> htmlHelper, Modal modal)
     : base(htmlHelper, modal)
 {
 }