windows phone 7 - Location Service on WP7,,Longitude and Latitude give me a NaN value - 


geocoordinatewatcher watcher = new geocoordinatewatcher();   protected override void onnavigatedto(system.windows.navigation.navigationeventargs e)         {             var myposition = watcher.position;             longtxtblock.text = (myposition.location.longitude).tostring();             latitxtblock.text = (myposition.location.latitude).tostring();              base.onnavigatedto(e);         }


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