Remote login from PC to a Cisco IP Phone using Extension Mobility API

private static void PostToService()
{
    bool ERROR = false;
    
    // Our string to be posted
    // I used AppSettings to store my userID, pincode and phoneaddress
    // You can change this as your desire
    byte[] buffer = Encoding.ASCII.GetBytes("xml="+ConfigurationManager.AppSettings["userID"]+""+ConfigurationManager.AppSettings["pincode"]+""+ConfigurationManager.AppSettings["phoneaddress"]+""+ConfigurationManager.AppSettings["userID"]+"");
    
    // HERE change A.B.C.D with the ip of your Call Manager
    // ATTENTION there's no connection test, if cannot connect to server, it crash!
    HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create("http://A.B.C.D/emservice/EMServiceServlet");
    WebReq.Method = "POST";
    WebReq.ContentType = "application/x-www-form-urlencoded";
    WebReq.ContentLength = buffer.Length;
    Stream PostData = WebReq.GetRequestStream();
    PostData.Write(buffer, 0, buffer.Length);
    PostData.Close();
    HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();
    Console.WriteLine(WebResp.StatusCode);
    Console.WriteLine(WebResp.Server);
    Stream Answer = WebResp.GetResponseStream();
    StreamReader _Answer = new StreamReader(Answer);

    /* Response interpretation */
    try
    {
        XmlTextReader objXmlTextReader = new XmlTextReader(Answer);
        
        while (objXmlTextReader.Read())
        {
            switch (objXmlTextReader.NodeType)
            {
                case XmlNodeType.Element: 
                    switch (objXmlTextReader.Name)
                    {
                        case "success":
                            Console.WriteLine("==> Login successfully <==");
                            break;
                        case "failure":
                            Console.WriteLine("==> Login Failed <==");
                            ERROR = true;
                            break;
                    }

                    while (objXmlTextReader.MoveToNextAttribute()) 
                        if (ERROR == true)
                        {
                            Console.Write("Error code: " + objXmlTextReader.Value + "\n");
                         }
                    break;
                case XmlNodeType.Text:
                    if (ERROR)
                    {
                        Console.Write("Error Message: ");
                        Console.Write(objXmlTextReader.Value + "\n");
                    }
                    break;
            }
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine("==> Error Parsing Output <==");
        Console.WriteLine(ex.ToString());
    }
    Answer.Close();
    
    Console.WriteLine("Disconnected");
}