WCF Documentation http://msdn2.microsoft.com/en-us/library/ ServiceContractAttribute [ServiceContract()] Indicates that an interface or a class defines a service contract in a Windows Communication Foundation (WCF) application. Use the ServiceContractAttribute attribute on an interface (or class) to define a service contract. Then use the OperationContractAttribute attribute on one or more of the class (or interface) methods to define the contract's service operations.   OperationCont 
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