How to label objects in an array?

Hello all,

I am working with the C# driver, creating orders based on availability of inventory. I have a nested BSON structure for my data, that is stored in MongoDB Compass.

public class OrderItem

        public string Type { get; set; }

        public string Vendor { get; set; }

        public string Description { get; set; }

        public double Cost { get; set; }

        [BsonElement("Order Qty")]
        public int OrderQty { get; set; }

        public int Serial { get; set; }

        public string PID { get; set; }
    public class Order

        public Order(List<OrderItem> listOfItems, string po, double orderTotal, DateTime timeOfOrder)
            OrderItemList = listOfItems;
            Po = po;
            OrderTotal = orderTotal;
            OrderDate = timeOfOrder;
        public ObjectId Id { get; set; }

        public List<OrderItem> OrderItemList { get; set; }

        public string Po { get; set; }

        [BsonElement("Order Total")]
        public double OrderTotal { get; set; }

        public DateTime OrderDate { get; set; }


and I have gotten my code to work properly by using below code:

                                OrderItem item = new OrderItem();
                                List<OrderItem> listOfItemsT = new List<OrderItem>();
                                foreach (DataGridViewRow row in DGV_orders.Rows)
                                    foreach (DataGridViewCell cell in row.Cells)
                                    item.Description = Convert.ToString(row.Cells["Description"].Value);
                                    item.Vendor = Convert.ToString(row.Cells["Vendor"].Value);
                                    item.Cost = Convert.ToDouble(row.Cells["Cost"].Value);
                                    item.OrderQty = Convert.ToInt32(row.Cells["OrderQty"].Value);
                                    item.Type = Convert.ToString(row.Cells["Type"].Value);
                                    item.PID = Convert.ToString(row.Cells["ProductId"].Value);
                                    item.Serial = Convert.ToInt32(row.Cells["ProductLink"].Value);

                                    double cost = Convert.ToDouble(row.Cells[1].Value);
                                    double qty = Convert.ToDouble(row.Cells[2].Value);

                                    double lineTotal = cost * qty;
                                    sum += lineTotal;

                                Order order = new Order(listOfItemsT,orderPO.Text, Math.Round(sum, 2),DateTime.Today);

everything works good. Now i just want to improve some smaller things, but I’m not sure where to look for the answers. When I view the data on Compass, the objects in the list array are obviously not named but I’m not too sure how I can name them.

See picture below.

All I’m hoping to accomplish is change the “Object”'s in order:Array to a productId or another parameter I have set already.