protected void Page_PreRender(object sender, EventArgs e)
{
GiftCertificatePaymentMethods = new List <int>(GiftCertificateService.GetCertificatePaymentMethodsID());
lvPaymentMethods.DataSource = PaymentService.GetAllPaymentMethods(true).Where(payment => payment.Type != PaymentType.GiftCertificate);
lvPaymentMethods.DataBind();
GiftCertificateTaxes = TaxServices.GetCertificateTaxes().Select(tax => tax.TaxId).ToList();
lvTaxes.DataSource = TaxServices.GetTaxes();
lvTaxes.DataBind();
}