System.Text.StringBuilder sb = new System.Text.StringBuilder();
        sb.Append("skutquantity");
        sb.Append("rn");

        for (int n = 0; n < ProductsToUpdate.Count; n++)
        {
            JMAProduct product = ProductsToUpdate.ElementAt(n);
            sb.Append(product.Sku);
            sb.Append("t");
            sb.Append(ObjectConverter.Int32Converter(product.StockQuantity));

            for (int n2 = 0; n2 < product.Listings.Count; n2++)
            {
                sb.Append("rn");

                JMAListing listing = product.Listings.ElementAt(n2);
                sb.Append(listing.Sku);
                sb.Append("t");
                sb.Append(listing.StockQuantity);

                if (n2 + 1 == product.Listings.Count())
                    break;

                sb.Append("rn");
            }

            if (n + 1 == ProductsToUpdate.Count)
                break;

            sb.Append("rn");
        }