How do I avoid accessing my Some Interface members in WCF Service

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WCFServices

I have a Interface which has 4 methods as M1,M2,M3,M4 and it uses by two clients with two different bindings as Client 1 uses BasicHttpBinding,Client 2 uses wsHttpBinding.I wanted to restrict the Client 1 to Use or Expose only the Methods M1 & M2 and for the other client to Use Methods M3 & M4.


Any help on this....