System.ServiceModel 4.0.0.0 Implement and insert a custom operation selector to customize the selection of the operation to which an incoming message is dispatched in a service application. Assign the object to the property to insert the custom selector. Defines the contract that associates incoming messages with a local operation to customize service execution behavior. Method 4.0.0.0 System.String To be added. To be added. To be added. To be added.