C#.NET HttpWebRequest

这是我用Fiddler得到的：“
POST /webroot/restricted/oddsdisplay/Main2DataFrame.aspx HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, */*
Referer: http://../webroot/restricted/oddsdisplay/live.aspx?sportid=2
Accept-Language: en-us
Content-Type: application/x-www-form-urlencoded
UA-CPU: x86
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
Connection: Keep-Alive
Content-Length: 42
Host: 6rf177956f1r.sbobet2.com
Pragma: no-cache
Cookie: 
ASP.NET_SessionId=k2t54v23bojsks455vz44n55; 
AWSUSER_ID=awsuser_id1228467703046r9474synid=-1&sportid=2&oddsStyle=&dt=1&scope=2”我试着用下面的代码来请求这个页面http://../webroot/restricted/oddsdisplay/Main2DataFrame.aspx?synid=-1&sportid=2&oddsStyle=&dt=1&scope=2，以得到它的数据
但是我得到的是这个页面的数据http://../webroot/restricted/oddsdisplay/Main2DataFrame.aspx
请高手们提点
Uri strUrl = new Uri(txtURL.Text.Trim() == "" ? "http://../webroot/restricted/oddsdisplay/Main2DataFrame.aspx?synid=-1&sportid=2&oddsStyle=&dt=1&scope=2" : txtURL.Text.Trim(),true);
                #region 创建httpWebRequest对象
                WebRequest webRequest = WebRequest.Create(strUrl);
                HttpWebRequest httpRequest = webRequest as HttpWebRequest;
                if (httpRequest == null)
                {
                    throw new ApplicationException(string.Format("Invalid url string: {0}", strUrl));
                }
                #endregion                #region post内容
                //ASCIIEncoding encoding = new ASCIIEncoding();
                //string postData = "";
                //byte[] data = encoding.GetBytes(postData);
                //httpRequest.Method = "POST";
                //httpRequest.ContentLength = data.Length;
                //Stream newStream = webRequest.GetRequestStream();
                //newStream.Write(data, 0, data.Length);
                //newStream.Close();
                //encoding.
                #endregion
                #region 填充httpWebRequest的基本信息                httpRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";                httpRequest.ContentType = "application/x-www-form-urlencoded";
                    
                CookieContainer cookieCon = new CookieContainer();
                cookieCon.Add(strUrl, new Cookie("AWSUSER_ID", (txtUserID.Text.Trim() == "" ? "awsuser_id1228467703046r9474" : txtUserID.Text.Trim())));
                cookieCon.Add(strUrl, new Cookie("AWSSESSION_ID", (txtSessionID.Text.Trim() == "" ? "awssession_id1228467703046r9474" : txtSessionID.Text.Trim())));
                cookieCon.Add(strUrl, new Cookie("ASP.NET_SessionId", (txtASPSessionID.Text.Trim() == "" ? "k2t54v23bojsks455vz44n55" : txtASPSessionID.Text.Trim())));                httpRequest.CookieContainer = cookieCon;                #endregion                #region 发送post请求到服务器并读取服务器返回信息
                Stream responseStream = httpRequest.GetResponse().GetResponseStream();
                #endregion                #region 读取服务器返回信息                string stringResponse = string.Empty;                using (StreamReader responseReader = new StreamReader(responseStream))
                {
                    stringResponse = responseReader.ReadToEnd();
                }                responseStream.Close();                #endregion                txtMsg.Text = stringResponse;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }