public IActionResult Edit(SellingOrderDto order)
        {
            if (ModelState.IsValid)
            {
                try
                {
                    sellingOrderService.UpdateOrder(order);
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!sellingOrderService.OrderExists(order.Id))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                var orders = sellingOrderService.GetAll();
                return(Json(new { isValid = true, html = Helper.RenderRazorViewToString(this, "_ViewAll", orders.ToList()) }));
            }

            ViewBag.Customers = new SelectList(customerService.GetAll(), "Id", "Fullname");
            ViewBag.Employees = new SelectList(employeeService.GetAll(), "Id", "Fullname");

            return(Json(new { isValid = false, html = Helper.RenderRazorViewToString(this, "Edit", order) }));
        }