public void addReadedLabel(String label){
        Article scannedArticle;
        if (newSale){
            if (label.equals("")){
                // readed barcode empty
                String msg = "Invalid bar-code";
                System.out.println(msg);
                lcdDisplay.println(msg);
            } else {
                scannedArticle = dBase.getAricle(label);
                if (scannedArticle == null){
                    String msg = "Product not found";
                    System.out.println(msg);
                    lcdDisplay.println(msg);
                } else {
                    // add article to lcd and to sale
                    System.out.println(scannedArticle.toString());
                    lcdDisplay.println(scannedArticle);
                    this.sale.addArticle(scannedArticle);
                }
            }
        }
    }