string postdata = "authcode=**&username=007&userpwd=007";
        byte[] post = Encoding.GetEncoding(936).GetBytes(postdata);
        HttpWebRequest myres = (HttpWebRequest)HttpWebRequest.Create("http://www.***.com/adduser");        myres.Method = "POST";
        myres.ContentLength = post.Length;
        myres.ContentType = "application/x-www-form-urlencoded";        Stream mystream = myres.GetRequestStream();        mystream.Write(post, 0, post.Length);        HttpWebResponse myreq = (HttpWebResponse) myres.GetResponse();
        StreamReader reader = new StreamReader(myreq.GetResponseStream(), Encoding.UTF8);
        Response.Write(reader.ReadToEnd());
为什么他那边收到的参数都是空呢?