errors in web service creation

I get the following error when i type the URL of the webservice in a Browser. Am i missing any step here in the process? I do not see a HelloWorldService.cs.asmx. http://localhost/HelloWorldService/HelloWorldService.cs.asmx/ I get the following error. Server Error in '/' Application. The resource cannot be found. Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly. Requested URL: /HelloWorldService/HelloWorldService.cs.asmx/ Thanks in advance ...