c# - ReverseGeocodeQuery does not return correct information -

i created class reverse geocode.

    public static class reversegeocoding     {     public static observablecollection<string> addresses = new observablecollection<string>();     public static string address;       public static task<mapaddress> doreversegeocodingasync( geocoordinate location )         {         mapaddress mapaddress = null;          var reversegeocode = new reversegeocodequery                                  {                                      geocoordinate = new geocoordinate( location.latitude, location.longitude )                                  };          var tcs = new taskcompletionsource<mapaddress>();         eventhandler<querycompletedeventargs<system.collections.generic.ilist<maplocation>>> handler = null;         handler = ( sender, args ) =>                       {                           if ( args.error != null )                               {                               tcs.setexception( args.error );                               }                           else if ( args.cancelled )                               {                               tcs.setcanceled();                               }                           else                               {                               if ( args.result.count > 0 )                                   {                                   var firstordefault = args.result.firstordefault();                                   if ( firstordefault != null )                                       {                                       mapaddress = firstordefault.information.address;                                       }                                   }                                reversegeocode.querycompleted -= handler;                               tcs.setresult( mapaddress );                               }                       };          reversegeocode.querycompleted += handler;         reversegeocode.queryasync();         return tcs.task;         }     } 

as call first (35, -112 example) country , country code (usa) shown. second time calling function data returned full expected (williams, az 86046).

any idea doing wrong here?

investigating more issue found out following:

the location (geocoordinate) taken center of map on page. if map zoomed (zoomlevel) less 10, find issue happening, , if map zoomed more 10 works ok. not sure why happening. idea? else noticed that?