WFA_psychometric_chart.Form1_main.pull_data_online C# (CSharp) Method

        private void pull_data_online(string country1, string state1, string city1, string street1)
        {
            //this function pulls the data from online devices...


            /*
            1.country,state,city,street,latitude,longitude,elev,zip
            */
            string country = country1;
            string state = state1;
            string city = city1;
            string street = street1;
           // string zip = zip1;
            int value;
          //  if (int.TryParse(zip, out value))
           // {

                if (country != "" && city != "")
                {
                    string join_string = "";
                    
                    //--THIS IS DONE BECAUSE state,and street if present some api do not give response
                    //if (state != "" && street != "")
                    //{
                    //    join_string = country + "," + state + "," + city + "," + street;
                    //}
                    //else
                    //{
                        join_string = country + "," + city;
                   // }

                    //geo location code goes here..
                    try
                    {                                                                                   

                        var address = join_string;
             
                        string BingMapsKey = "AgMVAaLqK8vvJe6OTRRu57wu0x2zBX1bUaqSizo0QhE32fqEK5fN8Ek4wWmO4QR4";
             
                        //Create REST Services geocode request using Locations API
                        string geocodeRequest = "http://dev.virtualearth.net/REST/v1/Locations/" + address + "?o=xml&key=" + BingMapsKey;

                      using (var wc = new WebClient())
                        {
                            string api_url = geocodeRequest;

                            var data = wc.DownloadString(api_url);
                            //  MessageBox.Show("string apic return =" + data);
                            string xml_string = data.ToString();
                            //MessageBox.Show(xml_string);


                            //--Parsing the xml document int the c# application...                     
                            //xml parsing...
                            XmlDocument xml = new XmlDocument();
                            xml.LoadXml(xml_string);

                            ProcessResponse(xml);
                            latPulledValue = latVal.ToString();//--Storing it in this variable to make it a string...
                            longPulledValue = longVal.ToString();

                            //MessageBox.Show("lat = " + latPulledValue + "long = " + longPulledValue);

                            //--This is for the elevation part...
                            string elevationAPI_URL = "http://dev.virtualearth.net/REST/v1/Elevation/List?pts=" + latVal + "," + longVal + "&key=AgMVAaLqK8vvJe6OTRRu57wu0x2zBX1bUaqSizo0QhE32fqEK5fN8Ek4wWmO4QR4&output=xml";

                            var elevationData = wc.DownloadString(elevationAPI_URL);
                            // MessageBox.Show("elev data = " + elevationData);
                            //--Now lets do the parsing...
                            //xml parsing...
                            XmlDocument xmlElevation = new XmlDocument();
                            xmlElevation.LoadXml(elevationData);
                            elevationPulledValue = elevationProcess(xmlElevation).ToString();//--This gives the elevation...
                                                                                             // MessageBox.Show("Pulled elevation");
                        }
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }//close of if...
           // }//close of if int try parse.
            else
            {
                MessageBox.Show(WFA_psychometric_chart.Properties.Resources.Please_enter_a_valid_zip_numbe);
            }

        }