byte[] requestBytes = System.Text.Encoding.ASCII.GetBytes(xml);
        req.Method = "POST";
        req.ContentType = "text/xml; encoding='utf-8'";
        req.ContentLength = requestBytes.Length;
        Stream requestStream = req.GetRequestStream();
        requestStream.Write(requestBytes, 0, requestBytes.Length);
        requestStream.Close();

        **HttpWebResponse res = (HttpWebResponse)req.GetResponse();**

        StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.Default);
        string backstr = sr.ReadToEnd();

        sr.Close();
        res.Close();