How to use web service on ScheduledTaskAgent1 for windows phone 8?

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Windows-Phone-8

I want to show my result from web service for push notification and current location update on web service.

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://gps-dev.gpsmobitrack.com/pickzy_dev/service/pzysyncloc_phase3");
                          request.Method = "Post";
                          //request.ContentType = "application/x-www-form-urlencoded";

                          request.Headers["authKey"] = authKey;
                          request.Headers["latitude"] = geoposition.Coordinate.Latitude.ToString();
                          request.Headers["longitude"] = geoposition.Coordinate.Longitude.ToString();
                          request.Headers["timeInterval"] = Minutes;
                          request.Headers["time"] = updatetime;
                          request.Headers["profileStatus"] = "true";
                          HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync();

                          using (var reader = new StreamReader(response.GetResponseStream()))
                          {
                              reader.ReadToEnd();
                          }

This is my code. I got result empty HttpWebRequest format correct or not?