using System.Net;          
 HttpWebRequest myHttpWebRequest = (HttpWebRequest)HttpWebRequest.Create("http://tuangai.com/group/40926.html");
            myHttpWebRequest.AllowAutoRedirect = false;
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
            MessageBox.Show(myHttpWebResponse.Headers.Get("Location"));
 

  '建立一個HttpWebRequest物件
Dim myHttpWebRequest As HttpWebRequest = HttpWebRequest.Create(sRedirectUrl)
         '禁止自動響應重定向
         myHttpWebRequest.AllowAutoRedirect = False
         '建立一個HttpWebResponse物件
Dim myHttpWebResponse As HttpWebResponse = myHttpWebRequest.GetResponse() '同步方式獲取
         '獲得重定向地址
         MessageBox.Show(myHttpWebResponse.Headers("Location")) '獲取HTTP報頭的Location值