Address Book Grabber

using System;
using System.Collections.Specialized;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections;

public partial class YahooContact : System.Web.UI.Page{
    // Declare the private variables
    private const string _addressBookUrl = "http://address.yahoo.com/yab/us/Yahoo_ab.csv?loc=us&.rand=1671497644&A=H&Yahoo_ab.csv";
    private const string _authUrl = "https://login.yahoo.com/config/login?";
    private const string _loginPage = "https://login.yahoo.com/config/login";
    private const string _userAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3";
    private string username = string.Empty;
    private string password = string.Empty;
    
    /// <summary>
    /// To Extract the Address Book
    /// </summary>
    /// <param name="uname"></param>
    /// <param name="upass"></param>
    /// <returns></returns>
    private ArrayList Extract(string uname, string upass){
        // Declare  variables
        ArrayList addressArray = null; 
        WebClient webClient = null;
        WebProxy we = null;
        byte[] firstResponse = null;
        byte[] thirdResponse = null;
        string[] lines = null;
        string[] tmp1 = null;
        NameValueCollection postToLogin = null;
        Match match = null; 
        Regex regex = null;
        Regex regexCrumb = null;
        NameValueCollection postDataAB = null;
        byte[] FourResponse = null;
        string login = string.Empty;
        string cookie = string.Empty;
        string newCookie = string.Empty;
        string thirdRes = string.Empty;
        string crumb = string.Empty;
        string csvData = string.Empty;
        string firstRes = string.Empty;
        bool result = false;
        addressArray = new ArrayList();
        try {
            // Create webClient object to get the methods for 
            // sending data to and receiving data from a resource identified by a URI.  
            webClient = new WebClient();
            // Set the useragent info in the header
            webClient.Headers[HttpRequestHeader.UserAgent] = _userAgent;
            webClient.Encoding = Encoding.UTF8;
            // Set the Proxy setting 
            we = new WebProxy("ngproxy.Persistent.co.in:8080");
            we.UseDefaultCredentials = true;
            webClient.Proxy = we;

            // Download the login page.
            firstResponse = webClient.DownloadData(_loginPage);
            firstRes = Encoding.UTF8.GetString(firstResponse);
            // Create the name value collection which we have to send with
            // login info such as user name and password
            postToLogin = new NameValueCollection();
            // By the Regular Expression Extact the desire name value collection
            regex = new Regex("type=\"hidden\" name=\"(.*?)\" value=\"(.*?)\"", RegexOptions.IgnoreCase);
            match = regex.Match(firstRes);
            while (match.Success){
                if (match.Groups[0].Value.Length > 0){
                    postToLogin.Add(match.Groups[1].Value, match.Groups[2].Value);
                }
                match = regex.Match(firstRes, match.Index + match.Length);
            }
            postToLogin.Add(".save", "Sign In");
            postToLogin.Add(".persistent", "y");

            login = uname.Split('@').GetValue(0).ToString();

            postToLogin.Add("login", login);
            postToLogin.Add("passwd", upass);
            // Again set the user agent and other information on heeder
            webClient.Headers[HttpRequestHeader.UserAgent] = _userAgent;
            webClient.Headers[HttpRequestHeader.Referer] = _loginPage;
            webClient.Encoding = Encoding.UTF8;
            webClient.Headers[HttpRequestHeader.Cookie] = webClient.ResponseHeaders[HttpResponseHeader.SetCookie];
            // Upload the page..
            webClient.UploadValues(_authUrl, postToLogin);
            // Get the cookies info
            cookie = webClient.ResponseHeaders[HttpResponseHeader.SetCookie];
            newCookie = string.Empty;
            tmp1 = cookie.Split(',');
            foreach (string var in tmp1){
                string[] tmp2 = var.Split(';');
                newCookie = (String.IsNullOrEmpty(newCookie) ? tmp2[0] : newCookie + ";" + tmp2[0]);
            }

            // set login cookie
            webClient.Headers[HttpRequestHeader.Cookie] = newCookie;
            // Download the page
            thirdResponse = webClient.DownloadData(_addressBookUrl);
            thirdRes = Encoding.UTF8.GetString(thirdResponse);
            regexCrumb = new Regex("type=\"hidden\" name=\"\\.crumb\" id=\"crumb1\" value=\"(.*?)\"", RegexOptions.IgnoreCase);
            match = regexCrumb.Match(thirdRes);
            if (match.Success && match.Groups[0].Value.Length > 0){
                crumb = match.Groups[1].Value;
            }
            // Create the mame value colection 
            postDataAB = new NameValueCollection();
            postDataAB.Add(".crumb", crumb);
            postDataAB.Add("vcp", "import_export");
            postDataAB.Add("submit[action_export_yahoo]", "Export Now");
            // Set the headers informations
            webClient.Headers[HttpRequestHeader.UserAgent] = _userAgent;
            webClient.Headers[HttpRequestHeader.Referer] = _addressBookUrl;
            // Upload the values
            FourResponse = webClient.UploadValues(_addressBookUrl, postDataAB);
            csvData = Encoding.UTF8.GetString(FourResponse);
            lines = csvData.Split('\n');
            foreach (string line in lines){
                string[] items = line.Split(',');
                if (items.Length < 5){
                    continue;
                }
                string email = items[4];
                string name = items[3];
                if (!string.IsNullOrEmpty(email) && !string.IsNullOrEmpty(name)){
                    email = email.Trim('"');
                    name = name.Trim('"');
                    if (!email.Equals("Email") && !name.Equals("Nickname")){
                        MailContact mailContact = new MailContact();
                        mailContact.Name = name;
                        mailContact.Email = email;
                        addressArray.Add(email);
                    }
                }
            }
            result = true;
        }
        catch(Exception ex){
            throw ex;
        } 
        return addressArray;
    }

    /// <summary>
    ///  On submit button clicked
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnSubmit_Click(object sender, EventArgs e){
        ArrayList contacts = new ArrayList();
        StringBuilder sb = new StringBuilder();
        int j = 1;
        contacts = Extract(txtusername.Text.Trim(), txtpassword.Text.Trim());
        for (int i = 0; i < contacts.Count; i++){
            if (contacts[i].ToString().Trim() != ""){
                sb.Append("(" + j + ") " + contacts[i].ToString() + "<br>");
                j++;
            }
        }
        dvcontacts.InnerHtml = sb.ToString();
    }
}

/// <summary>
/// Mail Contact Class
/// </summary>
public class MailContact{
    // To store the email id
    private string _email = string.Empty;
    // To store the name of person
    private string _name = string.Empty;
    public string Name{
        get { return _name; }
        set { _name = value; }
    }
    public string Email{
        get { return _email; }
        set { _email = value; }
    }
    public string FullEmail{
        get { return Email; }
    }
}