how to use Geolocation API for my website?

public static GeoPlugin FindMoreIpDetails(String IPAddress)
        {


            String httpCall = "http://www.geoplugin.net/asp.gp?ip=" + IPAddress;
            HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create(httpCall);
            HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();

            Encoding enc = System.Text.Encoding.GetEncoding(1252);
            StreamReader loResponseStream = new StreamReader(WebResp.GetResponseStream(), enc);

            GeoPlugin plugin = new GeoPlugin();
            plugin.ReceivedResponse = loResponseStream.ReadToEnd();
            String[] inParts = plugin.ReceivedResponse.Split('\"');
            // now the ODD numbers in inParts[x] is the wanted data
            if (inParts.Length.Equals(29)) // there should be 29 parts
            {
                Double result = 0;
                Int32 regionCode = 0;
                plugin.City = inParts[1];
                plugin.Region = inParts[3]; // and so on till InParts[27]
                plugin.AreaCode = inParts[5];
                plugin.DmaCode = inParts[7];
                plugin.CountryCode = inParts[9];
                plugin.CountryName = inParts[11];
                plugin.ContinentCode = inParts[13];
                plugin.Lattitude = Double.TryParse(inParts[15], NumberStyles.Float, CultureInfo.GetCultureInfo("EN-us"), out result) ? result : 0;
                plugin.Longitude = Double.TryParse(inParts[17], NumberStyles.Float, CultureInfo.GetCultureInfo("EN-us"), out result) ? result : 0;
                plugin.RegionCode = Int32.TryParse(inParts[19], out regionCode) ? regionCode : 0;
                plugin.RegionName = inParts[21];
                plugin.CurrencyCode = inParts[23];
                plugin.CurrencySymbol = inParts[25];
                plugin.CurrencyConverter = Double.TryParse(inParts[27], NumberStyles.Float, CultureInfo.GetCultureInfo("EN-us"), out result) ? result : 0;
                            }
            loResponseStream.Close();
            WebResp.Close();

            return plugin;
        }

public class GeoPlugin
    {
        /*
         * Known Response:
         * geoplugin_city=@0"Apeldoorn"@1geoplugin_region=@2"Gelderland"@3geoplugin_areaCode=@4"0"@5geoplugin_dmaCode=@6"0"
         * @7geoplugin_countryCode=@8"NL"@9geoplugin_countryName=@10"Netherlands"@11geoplugin_continentCode=@12"EU"
         * @13geoplugin_latitude=@14"52.216701507568"@15geoplugin_longitude=@16"5.9667000770569"
         * @17geoplugin_regionCode=@18"03"@19geoplugin_regionName=@20"Gelderland"@21geoplugin_currencyCode=@22"EUR"
         * @23geoplugin_currencySymbol=@24"€"@25geoplugin_currencyConverter=@26"0.6913855239"@27
         */
        public String City;
        public String Region;
        public String AreaCode;
        public String DmaCode;
        public String CountryCode;
        public String CountryName;
        public String ContinentCode;
        public Double Lattitude;
        public Double Longitude;
        public int RegionCode;
        public String RegionName;
        public String CurrencyCode;
        public String CurrencySymbol;
        public Double CurrencyConverter;
        public String ReceivedResponse;

    }