public void PrintProductInvoice(ProductsModel products, List <ProductDetails> details)
        {
            ProductInvoice pinvoice = new ProductInvoice();

            //foreach (DevExpress.XtraReports.Parameters.Parameter p2 in pinvoice.Parameters)
            //    p2.Visible = false;
            pinvoice.InitData(details);
            documentViewer1.DocumentSource = pinvoice;
            pinvoice.CreateDocument();
        }