A service is CLR type that exposes business functionality to Clients.In order to expose the Functionality as service,
1.The class/Interface must be decorated by ServiceContractAttribute.
2.The Methods(functions inside class) exposed through Service must be decorated with OperationContractAttribute
[ServiceContract] //service contract interface IHelloindigoService { [OperationContract] //method exposed via service with oepration contract annotaion string HelloService(); }