使用 C# 在 asp.net 中发布多个数据并取回响应

我正在尝试使用 C# asp.net 在"http://www.indianrail.gov.in/cgi_bin/inet_srcdest_cgi_time.cgi"处发布数据。问题是我使用的代码无法发布多个数据。当我在"http://www.indianrail.gov.in/cgi_bin/inet_trnnum_cgi.cgi"上只发布一个数据时，这段代码工作正常，但是当我尝试发布多个数据时，这不起作用。此外，每个输入数据都附加了一个隐藏字段，那么我与该隐藏字段有什么关系。

    ASCIIEncoding encoding = new ASCIIEncoding();
    string postData = "lccp_src_stncode=" + src;
    postData += ("&lccp_dstn_stncode=" + des);
    byte[] data = encoding.GetBytes(postData);
    HttpWebRequest myRequest =  (HttpWebRequest)WebRequest.Create("http://www.indianrail.gov.in/cgi_bin/inet_srcdest_cgi_time.cgi");
    myRequest.Method = "POST";
    myRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1; rv:11.0) Gecko/20100101 Firefox/11.0";
    myRequest.ContentType = "application/x-www-form-urlencoded";
    myRequest.ContentLength = data.Length;
    Stream newStream = myRequest.GetRequestStream();
    // Send the data.
    newStream.Write(data, 0, data.Length);
    newStream.Close();
    HttpWebResponse response = (HttpWebResponse)myRequest.GetResponse();
    //Get the stream containing content returned by the server.
    newStream = response.GetResponseStream();
    // Open the stream using a StreamReader for easy access.
    StreamReader reader = new StreamReader(newStream,Encoding.UTF8);
    // Read the content.
    string responseFromServer = reader.ReadToEnd();
    File.WriteAllText(@"C:'Users'Zohaib'Documents'Visual Studio 2010'WebSites'WebSite4'App_Data'data.txt", responseFromServer);
    // Clean up the streams.
    reader.Close();
    newStream.Close();
    response.Close();