[問題] 請問使用POST的問題

[huge (huge)]

        小弟最近在測試透過 POST 方式取得網頁的資訊
        然而在連結 http://www.ticket.com.tw/search 也就是年代售票網的活動消息
        發現我撰寫以下的程式
        到了 HttpWebResponse objResponse = (HttpWebResponse)objRequest.GetResponse(); 這一行
        都會出現 HTTP 500 內部伺服器錯誤
        所以想請教各位，小弟這模擬POST的程式是否有什麼錯誤呢？

        string SearchPage = @"http://www.ticket.com.tw/search.asp";
        String strPost = "KeyWord=&TypeRead=0&SelArea=0&SelYear=0&SelMonth=0&SelDate=0";
        StreamWriter myWriter = null;
        HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(SearchPage);
        objRequest.Method = "POST";
        objRequest.ContentLength = strPost.Length;
        objRequest.ContentType = "application/x-www-form-urlencoded";
        objRequest.Referer = @"http://www.ticket.com.tw/";
        try {
          myWriter = new StreamWriter(objRequest.GetRequestStream());
          myWriter.Write(strPost);
        }
        catch (Exception ex) {
        }
        finally {
          myWriter.Close();
        }

        HttpWebResponse objResponse = (HttpWebResponse)objRequest.GetResponse();
        using (StreamReader sr = new StreamReader(objResponse.GetResponseStream())) {
        string result = sr.ReadToEnd();
        // Close and clean up the StreamReader
        sr.Close();

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