public IActionResult Edit(int id)
        {
            ViewBag.Customers = new SelectList(customerService.GetAll(), "Id", "Fullname");
            ViewBag.Employees = new SelectList(employeeService.GetAll(), "Id", "Fullname");

            var order = sellingOrderService.GetOrder(id);

            if (order == null)
            {
                return(NotFound());
            }
            return(View(order));
        }