求解：抓取程序用了 仍报错“尝试自动重定向的次数太多”

我在写一个抓取网页的小程序，发现有些网页能够抓取成功呢，有些网页则要出报错“尝试自动重定向的次数太多”

如果抓取这个网页就要报错：http://spiedl.org/vsearch/servlet/VerityServlet?smode=strresults&SMODE=strsearch&possible1zone=article&pjournals=SPIEDL&KEY=SPIEDL&sort=rel&maxdisp=25&threshold=0&deliveryType=spiedl&possible1=paul&submit=Search
直接访问这个地址是没问题的

现在我把我的代码贴出来，希望高手帮忙解答下：
 string strUrl= http://spiedl.org/vsearch/servlet/VerityServlet?smode=strresults&SMODE=strsearch&possible1zone=article&pjournals=SPIEDL&KEY=SPIEDL&sort=rel&maxdisp=25&threshold=0&deliveryType=spiedl&possible1=paul&submit=Search;
     CookieContainer sparkc = new CookieContainer();
        HttpWebRequest SparkRequest = (HttpWebRequest)WebRequest.Create(strUrl);
        SparkRequest.AllowAutoRedirect = true;
        SparkRequest.CookieContainer = sparkc;
            HttpWebResponse SparkResponse = (HttpWebResponse)SparkRequest.GetResponse();//运行到这里就要报错！
        Stream dataStream = SparkResponse.GetResponseStream();
        StreamReader reader = new StreamReader(dataStream, Encoding.GetEncoding("UTF-8"));
        divLeft.InnerHtml = reader.ReadToEnd();
        reader.Close();