public ActionResult CheckZipCode(string code)
        {
            ZipCode zipcode = zipCodeRepository.GetByCode(code);

            if (zipcode != null)
            {
                return(Json(new
                {
                    Exist = true
                }));
            }
            return(Json(new
            {
                Exist = false,
                ZipCode = HttpUtility.HtmlEncode(code)
            }));
        }