Google Map 根据坐标 获取地址信息

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Net;

namespace Utility
{
    public class GoogleMapHelper
    {
        public string GetAddress(string lat, string lng)
        {
            WebClient client = new WebClient();
            string url = string.Format("http://maps.google.com/maps/api/geocode/xml?latlng={0},{1}&language=zh-CN&sensor=false", lat, lng);
            client.Encoding = Encoding.UTF8;
            try
            {
                string responseTest = client.DownloadString(url);
                XmlDocument doc = new XmlDocument();

                if (!string.IsNullOrEmpty(responseTest))
                {
                    doc.LoadXml(responseTest);

                    string xpath = @"GeocodeResponse/status";
                    XmlNode node = doc.SelectSingleNode(xpath);
                    string status = node.InnerText.ToString();

                    if (status == "OK")
                    {
                        xpath = @"GeocodeResponse/result/formatted_address";
                        node = doc.SelectSingleNode(xpath);
                        string address = node.InnerText.ToString();
                        return address;
                    }
                }
            }
            catch
            {
            }
            return "";
        }
    }
}