List.IndexOf(Object o) .NET 3.0

this.ddlCourier.SelectedIndex = affiliatecouriers.IndexOf(affiliatecouriers
        .Find(delegate(Courier courier)
        {
            return courier.ID ==
                int.Parse(iOrder.Supplementary.DeliveryCode);
        }));

References http://msdn2.microsoft.com/en-us/library/x0b5b5bc.aspx