Call .NET ( asmx webservice )

 I use this code to request URL and then parse xml
but the problem is that status code returned is zero ??


     RequestBuilder rb =
 new RequestBuilder(RequestBuilder.GET, URL.encode("http://www.w3schools.com/webservices/tempconvert.asmx/CelsiusToFahrenheit?Celsius=50"));       

     
     try{
         
     
   
    rb.sendRequest(null, new RequestCallback() {
       
       
        @Override
        public void onResponseReceived(Request request, Response response) {
            // TODO Auto-generated method stub
       
       
      
     if(response.getStatusCode() == 200){
                String aid = response.getText(); //this just parses the response in order to get the string I need
               Window.alert("Sucess: "+ aid);
            
           }
        
              
        
        }
       
        @Override
        public void onError(Request request, Throwable exception) {
            // TODO Auto-generated method stub
            System.out.print("Error Occure ");
        }
    });
     }
     
     catch(Exception ex){
         System.out.print(ex);
     }
     
    
    is there any another code or classes used to call webservice ??
   

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