private void compareCSVtoList(string csvFile)
        {
            string[][] invoice = parseCSV(csvFile);
            /* invoice array looks like
             * 2,CPP6500
             * 5,CSMD489
             * 2,CPP6500
             */

            List<string[]> items = new List<string[]>(itemsList.Items.Count);
            getListCompounded(ref items);
            /* items array looks like
             * 3,CPP6500
             * 5,CSMD489
             * Items will not appear twice in a row, they are compounded into one line
             */

            // how to compare both list of items?
            // and find missing and extra items?
            // need to counter bug where an invoice with 2x e6500 and then further down 3x e6500
        }