C# GetResponse with Timeout returning nulls in WinApp

i call following routine when loop thru sql database and try long\lat coordinates for 20-30 customer sites. works fine in debug mode when step thru main loop , stop between each call geocoderlocation routine. when let program run @ full speed, routine sporadically returns nulls.  though timeout fix that, not.

thank in advance , forward helping me upgrade routine more reliable , return results.

        public class geocoderlocation
        {
            public double longitude { get; set; }
            public double latitude { get; set; }

            public override string tostring()
            {
                return string.format("{0}, {1}", latitude, longitude);
            }
        }

        public static geocoderlocation locate(string query)
        {
            try
            {
                webrequest request = webrequest
                   .create("http://maps.googleapis.com/maps/api/geocode/xml?sensor=false&address="
                      + httputility.urlencode(query));
                using (webresponse response = request.getresponse())
                {
                    using (stream stream = response.getresponsestream())
                    {
                        request.timeout = 5000;
                        xdocument document = xdocument.load(new streamreader(stream));
                        xelement longitudeelement = document.descendants("lng").firstordefault();
                        xelement latitudeelement = document.descendants("lat").firstordefault();
                        if (longitudeelement != null && latitudeelement != null)
                        {
                            return new geocoderlocation
                            {
                                longitude = double.parse(longitudeelement.value, cultureinfo.invariantculture),
                                latitude = double.parse(latitudeelement.value, cultureinfo.invariantculture)
                            };
                        }
                    }
                }
                messagebox.show("web response null " + query.tostring());
                return null;
            }
            catch (webexception ex)
            {
                messagebox.show(ex.message, "exception");
                return null;
            }
        }

it taking more 5 seconds.  make timeout larger

request.timeout = 5000;

---

jdweng

Visual Studio Languages  ,  .NET Framework  >  Visual C#