C# - How To Override Wsdl Generation In Web Services .Net

I would like to create a WebService in .Net who expose multiple WebMethods

I need a WebService version per new implementation (WebMethod or New Property in Business Object), like this :

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Service : System.Web.Services.WebService
{
[WebMethod]
[WebServiceVersion("1.0")]
public string HelloWorld()
{
return "Hello World";
}
[WebMethod]
[WebServiceVersion("1.1")]
public string NewMethodInVersion1_1()
{
return "Hello World";
}
}

With UrlRewriting or HttpHandler :

HelloWorld WebMethod only : http://localhost/Service/1.0/Service.asmx

HelloWorld WebMethod and NewMethodInVersion1_1 : http://localhost/Service/1.1/Service.asmx

How can i generate a wsdl dynamically for the specific version used by the customer ?