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I'm trying to send a text message from my C# application in Windows using Google Voice service. I found this code sample (I'll quote it below) but it doesn't work -- the code always throws an exception, "Unable to get the Session-id field from Google."

using System;
using System.Collections.Generic;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;


namespace TestGoogleVoiceTxt

 class Program
 
 static void Main(string args)
 
 Console.WriteLine("Preparing to send a text message...");

 try
 
 Jitbit.Utils.SharpGoogleVoice sgv = new Jitbit.Utils.SharpGoogleVoice("myemailaddress@gmail.com", "mypassword");

 sgv.SendSMS("+11234567890", "Test from C#");

 Console.WriteLine("Msg was sent OK.");
 
 catch (Exception ex)
 
 Console.WriteLine("ERROR: " + ex.Message);
 

 
 




namespace Jitbit.Utils

 class SharpGoogleVoice
 
 private CookieWebClient _webClient;

 private string _rnrse;

 private string _username;
 private string _password;

 private const string USERAGENT = "Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_2_1 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5H11 Safari/525.20";

 public SharpGoogleVoice(string username, string password)
 
 _username = username;
 _password = password;
 _webClient = new CookieWebClient();
 

 private void Login()
 
 _webClient.Headers.Add("User-agent", USERAGENT); //mobile user agent to save bandwidth (google will serve mobile version of the page)

 //get "GALX" field value from google login page
 string response = Encoding.ASCII.GetString(_webClient.DownloadData("https://accounts.google.com/ServiceLogin?service=grandcentral"));
 Regex galxRegex = new Regex(@"name=""GALX"".*?value=""(.*?)""", RegexOptions.Singleline);
 string galx = galxRegex.Match(response).Groups[1].Value;

 //Check the response that is received from Google:
 // -- this is a login screen
 // System.IO.File.WriteAllText(@"I:GoogleResponse.html", response, Encoding.UTF8);

 //sending login info
 _webClient.Headers.Add("Content-type", "application/x-www-form-urlencoded;charset=utf-8");
 _webClient.Headers.Add("User-agent", USERAGENT); //mobile user agent to save bandwidth (google will serve mobile version of the page)
 byte responseArray = _webClient.UploadData(
 "https://accounts.google.com/ServiceLogin?service=grandcentral",
 "POST",
 PostParameters(new Dictionary<string, string>
 
 "Email", _username,
 "Passwd", _password,
 "GALX", galx,
 "PersistentCookie", "yes"
 ));
 response = Encoding.ASCII.GetString(responseArray);
 

 /// <summary>
 /// creates a byte-array ready to be sent with a POST-request
 /// </summary>
 private static byte PostParameters(IDictionary<string, string> parameters)
 
 string paramStr = "";

 foreach (string key in parameters.Keys)
 
 paramStr += key + "=" + HttpUtility.UrlEncode(parameters[key]) + "&";
 

 return Encoding.ASCII.GetBytes(paramStr);
 

 private void TryGetRNRSE()
 
 if (!GetRNRSE())
 
 //we can't find the required field on the page. Probably we're logged out. Let's try to login
 Login();
 if (!GetRNRSE())
 
 throw new Exception("Unable to get the Session-id field from Google.");
 
 
 

 /// <summary>
 /// Gets google's "session id" hidden-field value
 /// </summary>
 private bool GetRNRSE()
 
 _webClient.Headers.Add("User-agent", USERAGENT); //mobile user agent to save bandwidth (google will serve mobile version of the page)

 //get goovle voice "homepage" (mobile version - to save bandwidth)
 string response = Encoding.ASCII.GetString(_webClient.DownloadData("https://www.google.com/voice/m"));

 //find the hidden field
 Regex rnrRegex = new Regex(@"<input.*?name=""_rnr_se"".*?value=""(.*?)""");
 if (rnrRegex.IsMatch(response))
 
 _rnrse = rnrRegex.Match(response).Groups[1].Value;
 return true;
 
 return false;
 


 /// <summary>
 /// Send s text-message to teh specified number
 /// </summary>
 /// <param name="number">Phone number in '+1234567890'-format </param>
 /// <param name="text">Message text</param>
 public void SendSMS(string number, string text)
 
 if (!ValidateNumber(number))
 throw new FormatException("Wrong number format. Should be '+1234567890'. Please try again.");

 TryGetRNRSE();

 text = text.Length <= 160 ? text : text.Substring(0, 160);

 byte parameters = PostParameters(new Dictionary<string, string>
 
 "phoneNumber", number,
 "text", text,
 "_rnr_se", _rnrse
 );

 _webClient.Headers.Add("Content-type", "application/x-www-form-urlencoded;charset=utf-8");
 byte responseArray = _webClient.UploadData("https://www.google.com/voice/sms/send", "POST", parameters);
 string response = Encoding.ASCII.GetString(responseArray);

 if (response.IndexOf(""ok":true") == -1)
 throw new Exception("Google did not answer with an OK responsenn"+response);
 

 public static bool ValidateNumber(string number)
 
 if (number == null) return false;
 return Regex.IsMatch(number, @"^+d11$");
 
 

 [System.ComponentModel.DesignerCategory("Code")] //to fix the annoying VS "subtype" issue
 internal class CookieWebClient : System.Net.WebClient
 
 private CookieContainer _cookieContainer = new CookieContainer();
 public CookieContainer CookieContainer
 
 get return _cookieContainer; 
 set _cookieContainer = value; 
 

 protected override WebRequest GetWebRequest(Uri address)
 
 WebRequest request = base.GetWebRequest(address);
 if (request is HttpWebRequest)
 
 (request as HttpWebRequest).CookieContainer = _cookieContainer;
 
 return request;
 
 

I did some debugging of that script and if I put a breakpoint in the Login() function and save the response from the accounts.google.com/ServiceLogin?service=grandcentral page (as I showed in the code above) the page returned by the service ("GoogleResponse.html" file contents) is this:

So it is clearly wanting me to login there instead of doing the "hack" that the author of that script was trying to achieve.

So my question is how do I incorporate that into my application?

PS. My assumption is that I need to somehow display that login script in a popup web browser page from my app, then somehow collect a login session ID from it after the user enters the email and password, and then use it for further requests to send the SMS. Any pointers will be appreciated...