To expose the functionality of the WSE to the client, some document mentions this:

To expose the functionality of the WSE to the client, you must derive the Web service proxy class from the class WebServicesClientProtocol, which lives in the namespace Microsoft.Web.Services. So when you add a Web reference to your project and want to use the WSE, you must modify the Reference.cs file manually and change the base class of the proxy to WebServicesClientProtocol. Currently, Visual Studio.NET does not provide an option to mark a Web service as WSE-enabled.

In my project, I cannot find any file named Reference.cs. Can someone tell me where that file is and what has to be done?