public IActionResult Index()
        {
            PanelIndexViewModel model = new PanelIndexViewModel();
            var companyId             = User.Identity.CompanyId();

            model.Company         = _companyService.GetById(companyId);
            model.Customers       = _customerService.GetListByCompanyId(companyId);
            TempData["CompanyId"] = companyId.ToString();
            return(View(model));
        }
        public IActionResult Index(PanelIndexViewModel model)
        {
            var companyId = User.Identity.CompanyId();

            model.Company   = _companyService.GetById(companyId);
            model.Customers = _customerService.GetListByCompanyId(companyId);
            if (string.IsNullOrEmpty(model.Customer.CitizienNumber))
            {
                ModelState.AddModelError("TcError", "T.C. alanı boş geçilemez.");
                return(View(model));
            }
            else
            {
                model.Customer.CompanyId = int.Parse(TempData["CompanyId"].ToString());
                _customerService.Add(model.Customer);

                return(RedirectToAction("Index", model));
            }
        }