public ActionResult Join(MemberModel model)
        {            
            ModelState.Remove("RegDate");
            string captcha = AccountUtil.GetCaptcha();
            if (!captcha.Equals(model.ConfirmationCode, StringComparison.OrdinalIgnoreCase))
            {                
                ModelState.AddModelError("ConfirmationCode", "驗證碼錯誤");
            }
            else if (model.Password != model.CheckPassword)
            {
                ModelState.AddModelError("Password", "");
                ModelState.AddModelError("CheckPassword", "登入密碼與確認密碼不一樣");
            }
            else
            {
                if (model.IsValid())
                {
                    model.SendOrder();
                }
            }

            if (model.SendOrderOk)
            {
                return View("LogOff", model);
            }
            else
            {
                return View(model);
            }
        }