WCF service interface

Question

Is it possible to declare method in service interface without operationcontract attribute? Example is mention below. [ServiceContract] interface IService { [OperationContract] void Display(); //Without Operation contract void Show(); } class Service : IService { public void Display() { throw new NotImplementedException(); } public void Show() { throw new NotImplementedException(); } } 1. If yes then what is use of it. Interviewer asked me this question recently. Please help me.

Nishant Mittal · Answer

I have never tried the same but logically seems yes we define the method without opeartional contract..then its of no use. Come to the point  Operational Contract use to serialize during method call.Without defining its of no use. Operational Contract also define operation that is part of a service contract in WCF. I think in case we define methods without Operational Contract its of no use or can be use for small procession but cant be exposed to client.