public decimal CalculateCartTaxRate(Cart CurrentCart) { CartDB db = new CartDB(); if (CurrentCart.BillingLocation != null) { return db.CartGetTaxFromLocation(CurrentCart.SiteId, CurrentCart.BillingLocation.CountryCode, CurrentCart.BillingLocation.StateCode, CurrentCart.BillingLocation.PostalCode); } else { return (decimal)0; } }