c# - Mapquest: This key is not authorized for this service -

i trying use geocoding.net reverse geocode latitude , longitude formatted address. want address mapquest , not other providers yahoo, google , bing. code:

    try     {         igeocoder geocoder = new mapquestgeocoder("fmjtd%7cluu82q6***********");         var addresses = geocoder.reversegeocode(latitude, longitude);         return ("formatted address :  " + addresses.first().formattedaddress);     }     catch (exception exception)     {         return exception.message;     } 

this code catches exception , thorws error "this key not authorized service."

i know error occurs when try hit enterprise api of geocoder i.e http://www.mapquestapi.com/geocoding/v1/reverse?key=*******************

for free , open source usage, should hit api:

http://open.mapquestapi.com/geocoding/v1/address?key=your-key-here

how can this? there option of passing post url in constructor itself? or other way?

scanning on open-source code of geocoding.net, looks need set "useosm" property of geocoder object true:

geocoder.useosm = true;