Consider the following which registers services and configures options: [!code-csharp[](~/fundamentals/configuration/index/samples/6.x/ConfigSample/program.cs?name=snippet2)] Related groups of registrations can be moved to an extension method to register services. For example, the configuration services are added to the following class: [!code-csharp[](~/fundamentals/configuration/index/samples/6.x/ConfigSample/Options/MyConfigServiceCollectionExtensions.cs)] The remaining services are registered in a similar class. The following code uses the new extension methods to register the services: [!code-csharp[](~/fundamentals/configuration/index/samples/6.x/ConfigSample/program.cs?name=snippet3)] **_Note:_** Each `services.Add{GROUP_NAME}` extension method adds and potentially configures services. For example, adds the services MVC controllers with views require, and adds the services Razor Pages requires.