CustomerService.cs

public class CustomerServices
    {
        private readonly IDataRepository dataRepository;

        public CustomerServices(IDataRepository repository)
        {
            dataRepository = repository;
        }

        public string FetchCustomerXmlById(int customerId)
        {
            Customer customer = dataRepository.GetCustomer(customerId);
            string xml = "<Error>Customer not found</Error>";
            if(customer != null)
            {
                xml = "<Customer id='" + customerId + "'>" + customer.Name + "</Customer>";
            }
            return xml;
        }

        public string FindCustomersXmlByName(string nameToMatch)
        {
            IList<Customer> matches = dataRepository.FindCustomers(nameToMatch);
            string xml = "<Matches count='" + matches.Count + "'>";
            foreach(Customer customer in matches){
                xml += "<Customer id='" + customer.Id + "'>" + customer.Name + "</Customer>";
            }
            xml += "</Matches>";
            return xml;
            
        }
        
    }