Create .Net CashSaleItem using SuiteTalk

Would someone be kind enough to show me how to create a CashSaleItem in .net?  So far this is what I have

   CashSale cashSale = new CashSale();
   
    CashSaleItem[] cashSaleItemArray = new CashSaleItem[1];

    for (int i = 0; i < cashSaleItemArray.Length; i++)
    {

        RecordRef item = new RecordRef();
        RecordRef unit = new RecordRef();

        item.internalId = "14";
        unit.name = "Each";


        CashSaleItem item2 = new CashSaleItem();
        item2.description = "Donation";
        item2.rate = "60";
        item2.units = unit;
        item2.item = item;
       
        cashSaleItemArray[i] = item2;

    }

    CashSaleItemList cashSaleItems = new CashSaleItemList();
    cashSaleItems.item = cashSaleItemArray;
   
    cashSale.itemList = cashSaleItems;
   
    WriteResponse result = service.add(cashSale);


Thank you