[c#] problema google Maps XML Iterator

[3nigma666]

Buon di,

io ho questo foglio XML di risposta da una interrogazione di google maps :

<GeocodeResponse> 
 <status>OK</status> 
 <result> 
  <type>street_address</type> 
  <formatted_address>1600 Amphitheatre Pkwy, Mountain View, CA 94043, USA</formatted_address> 
  <address_component> 
   <long_name>1600</long_name> 
   <short_name>1600</short_name> 
   <type>street_number</type> 
  </address_component> 
  <address_component> 
   <long_name>Amphitheatre Pkwy</long_name> 
   <short_name>Amphitheatre Pkwy</short_name> 
   <type>route</type> 
  </address_component> 
  <address_component> 
   <long_name>Mountain View</long_name> 
   <short_name>Mountain View</short_name> 
   <type>locality</type> 
   <type>political</type> 
  </address_component> 
  <address_component> 
   <long_name>San Jose</long_name> 
   <short_name>San Jose</short_name> 
   <type>administrative_area_level_3</type> 
   <type>political</type> 
  </address_component> 
  <address_component> 
   <long_name>Santa Clara</long_name> 
   <short_name>Santa Clara</short_name> 
   <type>administrative_area_level_2</type> 
   <type>political</type> 
  </address_component> 
  <address_component> 
   <long_name>California</long_name> 
   <short_name>CA</short_name> 
   <type>administrative_area_level_1</type> 
   <type>political</type> 
  </address_component> 
  <address_component> 
   <long_name>United States</long_name> 
   <short_name>US</short_name> 
   <type>country</type> 
   <type>political</type> 
  </address_component> 
  <address_component> 
   <long_name>94043</long_name> 
   <short_name>94043</short_name> 
   <type>postal_code</type> 
  </address_component> 
  <geometry> 
   <location> 
    <lat>37.4217550</lat> 
    <lng>-122.0846330</lng> 
   </location> 
   <location_type>ROOFTOP</location_type> 
   <viewport> 
    <southwest> 
     <lat>37.4188514</lat> 
     <lng>-122.0874526</lng> 
    </southwest> 
    <northeast> 
     <lat>37.4251466</lat> 
     <lng>-122.0811574</lng> 
    </northeast> 
   </viewport> 
  </geometry> 
 </result> 
</GeocodeResponse>

di cui devo prendere i seguenti valori:

<geometry> 
   <location> 
    <lat>37.4217550</lat> 
    <lng>-122.0846330</lng> 
   </location>

37.4217550, -122.0846330

e per prenderli faccio cosi:

 private string returnValore(XPathNavigator navigator, string type)
        {
            XPathExpression expr;

            expr = navigator.Compile("/GeocodeResponse/result/geometry/location/"+type); //dove type = lat (latitudine)o lng (longitudine)

            XPathNodeIterator iterator = navigator.Select(expr);

            iterator.MoveNext()
                return iterator.Current.Value.ToString();            
        }

ma in realtà mi restituisce tutti i valori dentro XMl invece che selezionarmi solo quello che voglio io.

perchè?!?!??!??!