关于采集的问题

Question

小弟做了一个采集程序，采集的函数如下：
  private static string GetPage(string url)
        {
            string ucode = "utf-8";
            StreamReader sr = null;
            //  try
            //  {
            url = url.Replace("\'", "");            url = url.Replace(" target=_top ", " ");
            url = url.Replace("  target=\"_top", " ");
            url = url.Replace("target=\"_top", " ");
            url = url.Replace("target=_top", " ");
            url = url.Replace("target=_blank", " ");
            url = url.Replace("\"", "");
          //  request.AllowAutoRedirect = false;//
            try
            {
                if ("gb2312".Equals(ucode.Trim().ToLower()))
                {
                    Encoding en = Encoding.GetEncoding("gb2312");                    HttpWebResponse response = (System.Net.HttpWebResponse)HttpWebRequest.Create(url).GetResponse();
                    Stream s = response.GetResponseStream();
                    sr = new StreamReader(s, en);
                }
                else
                {
                    Encoding en = Encoding.GetEncoding("utf-8");                    HttpWebResponse response = (System.Net.HttpWebResponse)HttpWebRequest.Create(url).GetResponse();
                    Stream s = response.GetResponseStream();
                    sr = new StreamReader(s, en);                }
            }
            catch { return ""; }            if (sr == null)
            {
                return "";
            }
            else if ("".Equals(sr.ToString()))
            {
                return "";
            }
            else
            {
                return sr.ReadToEnd();
            }
            // }
            // catch (Exception ddd)
            // {
            //   HttpContext.Current.Response.Write(ddd.ToString());
            //fwt.print(ddd.ToString());
            //Response.Write("<script>alert('无法连接远程站点！');</script>");
            //    return "";
            //  }        }
当我采集其他页面时，都是正常的，但是当我采集http://sh.58.com/zufang/时，却发现得到的是北京的页面，这是怎么回事啊？

Answer 1

我用System.Diagnostics.Process.Start(urlse);都能直接在浏览器上打开的。