title: Wcf different clients different methods same interface
body: <p>I have a service with tcpbinding.I have an interface with 20 methods.I have got different types of clients.one of them can access 10 methods of these 20 and I have got another client who can access all the 20 methods and another who can access only 15.so how can i achieve this??how can I go for authentication for operation contract?which attribute?Is there any other way to achieve this?can you please specify in how many ways we can achieve this?</p>