public IActionResult Create(List <string> companyTypesString)
        {
            List <CompanyType> companyTypes = companyTypesString.Select(x => new CompanyType {
                Title = x
            }).ToList();

            foreach (CompanyType companyType in companyTypes)
            {
                if (companyTypesRepository.Exists(companyType))
                {
                    ModelState.AddModelError(companyType.Title, "Item already exists");
                }
            }
            if (ModelState.IsValid)
            {
                foreach (CompanyType companyType in companyTypes)
                {
                    companyTypesRepository.Create(companyType);
                }
                return(RedirectToAction("Index"));
            }
            return(View(companyTypesString));
        }