public ViewResult GeneralReport()
        {
            List <string> datatypes = new List <string>
            {
                "Samochody", "Wynajmy", "Klienci"
            };
            ReportsGeneralReportViewModel model = new ReportsGeneralReportViewModel();

            model.DropdownItems = datatypes;
            return(View(model));
        }
        public IActionResult GeneralReport(ReportsGeneralReportViewModel model)
        {
            switch (model.SelectedItem)
            {
            case "Samochody":
                break;

            case "Wynajmy":
                break;

            case "Klienci":
                break;
            }
            return(RedirectToAction("GeneralReport"));
        }