public int ValidateSubscription(SubscriptionWebServiceModel subscription, BusWebServiceModel bus)
        {
            int returnCode = 3;

            try
            {
                returnCode= subscriptionService.ValidateSubscription(new Subscription() { GUID = subscription.GUID },
                                                                     new Bus() { GUID = bus.GUID });
            }
            catch (Exception)
            {
            }

            return returnCode;
        }
        /// <summary>
        /// Renew an existing subscription
        /// </summary>
        /// <param name="subscription">The subscription to renew</param>
        /// <param name="startDate">The start date from which to renew the subscription</param>
        /// <returns></returns>
        public SubscriptionWebServiceModel RenewSubscriptionWithStartDate(SubscriptionWebServiceModel subscription, DateTime startDate)
        {
            var dmSubscription = new Subscription { GUID = subscription.GUID };
            subscription = null;

            try
            {
                subscription = SubscriptionWebServiceModel.FromDataModel(subscriptionService.RenewSubscription(dmSubscription, startDate));
            }
            catch (Exception)
            {
            }

            return subscription;
        }