public void GetPdfInvoice()
        {
            InvoiceProxy proxy = new InvoiceProxy();
            InvoiceDto dto1 = this.GetItemSale();
            proxy.Insert(dto1);

            Assert.IsTrue(dto1.Uid > 0, "Uid must be > 0 after save.");

            proxy.GetPdfInvoiceByUid(dto1.Uid, "ItemSale.pdf");									// Template not specified. Will use default template.
            proxy.GetPdfInvoiceByUid(dto1.Uid, this.IncTaxTemplateUid, "ItemSaleIncTax.pdf");	// Use specific template.
        }