Ws.ServiceModel Namespace

Contains Attribute classes that define aspects of the Web Services service model.

Public ClassMessageParameterAttributeControls the name of the request and response parameter names; cannot be used with System.ServiceModel.Channels.Message or message contracts.
Public ClassOperationContractAttributeIndicates that a method defines an operation that is part of a service contract in an application.
Public ClassServiceContractAttributeIndicates that an interface or a class defines a service contract in an application.

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