You are developing a Windows Communication Foundation (WCF) service that allows customers to update financial data. The client applications call the service in a transaction. The service contract is…

You are developing a Windows Communication Foundation (WCF) service that allows customers to update financial data. The client applications call the service in a transaction. The service contract is defined as follows. (Line numbers are included for reference only.) Customers report that the transaction completes successfully even if the Update method throws an exception. You need to ensure that the transaction is aborted if the Update method is not successful. What should you do?