public Customer GetCustomer(int id)
 {
     Customer customer = new Customer();
     customer.Id = id;
     customer = new entityServices.CustomerService().Load(customer);
     return customer;
 }
        public void UpdateCustomer(Customer customer)
        {
            Guid dataSignature = DataSignature.Current;
            if (dataSignature == Guid.Empty)
            {
                //this is an update method, so no data signature to
                //compare against is an exception:
                throw new FaultException<NoDataSignature>(new NoDataSignature());
            }

            Customer currentState = CustomerEntityService.Load(customer);
            Guid currentDataSignature = DataSignature.Sign(currentState);
            //if the data signatures match then update:
            if (currentDataSignature == dataSignature)
            {
                CustomerEntityService.Update(customer);
            }
            else
            {
                //otherwise, throw concurrency violation exception:
                throw new FaultException<ConcurrencyViolation>(new ConcurrencyViolation());
            }
        }