C# JSON Requests and Responses for Windows Phone 7.1 app -

i'm trying implement https://gist.github.com/jgable/881673 have posted question there, please me result? problem in

private void button_click(object sender, routedeventargs e) {     (new testservice()).startservice(         resp =>         {             messagebox.show(resp.data, "response", messageboxbutton.ok);         },         err =>         {             messagebox.show(err.message, "error", messageboxbutton.ok);         }); } 

the resp.data not return json response cannot response , continue login process.

thanks in advance /magefi