public ActionResult Return(int?id) { if (id == null) { return(new HttpStatusCodeResult(HttpStatusCode.BadRequest)); } SaleOrder order = _context.SaleOrders.Find(id); order.Items = _context.Items.Where(i => i.SaleOrderId == order.Id).Include(i => i.Product).ToList(); foreach (var item in order.Items) { item.Product.Stocks = _context.Stocks.Where(s => s.ProductId == item.ProductId).ToList(); } if (order == null) { return(HttpNotFound()); } if (order.UserId != Global.User.Id) { return(new HttpStatusCodeResult(HttpStatusCode.Unauthorized)); } order.ReturnOrder(); foreach (var item in order.Items) { foreach (var stock in item.Product.Stocks) { if (stock.Id == 0) { _context.Entry(stock).State = EntityState.Added; } } } _context.Entry(order).Property(o => o.OrderStatus).IsModified = true; _context.Entry(order).State = EntityState.Detached; _context.SaveChanges(); return(RedirectToAction("Index")); }