You are implementing a custom console application to host a WCF Data Service. You need to implement the class that hosts and instantiates the data service.

Which class should you extend?

The DataServiceHost class is the WCF Data Services class derived from WebServiceHost that is used to instantiate data services. To create a custom host, you must extend this class.

The DataService class is the main entry point for developing the ADO.NET Data Service, not the service host.

The DataServiceHostFactory class is used by the infrastructure of WCF Data Services to connect to Windows Communication Foundation (WCF). It is not the correct class to extend.