Visual Studio .NET - I want to export contact address from my email id by programming in Asp.net , C#.net. Please Guide !

As per my Web Application , Requirement. I have to export my contact address from my email id. Like if I have email id in yahoo , and i give my email id and it's password. Then by programming in asp.net and C#.net , I will export my contact address from this email id.

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

namespace Gnilly.Syndication.Mail
{
    public class YahooExtract
    {
        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";

        public bool Extract( NetworkCredential credential, out MailContactList list )
        {
            bool result = false;

            list = new MailContactList();

            try
            {
                WebClient webClient = new WebClient();
                webClient.Headers[ HttpRequestHeader.UserAgent ] = _userAgent;
                webClient.Encoding = Encoding.UTF8;

                byte[] firstResponse = webClient.DownloadData( _loginPage );
                string firstRes = Encoding.UTF8.GetString( firstResponse );


                NameValueCollection postToLogin = new NameValueCollection();
                Regex regex = new Regex( "type=\"hidden\" name=\"(.*?)\" value=\"(.*?)\"", RegexOptions.IgnoreCase );
                Match 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" );

                string login = credential.UserName.Split( '@' )[ 0 ];
                postToLogin.Add( "login", login );
                postToLogin.Add( "passwd", credential.Password );

                webClient.Headers[ HttpRequestHeader.UserAgent ] = _userAgent;
                webClient.Headers[ HttpRequestHeader.Referer ] = _loginPage;
                webClient.Encoding = Encoding.UTF8;
                webClient.Headers[ HttpRequestHeader.Cookie ] = webClient.ResponseHeaders[ HttpResponseHeader.SetCookie ];

                webClient.UploadValues( _authUrl, postToLogin );
                string cookie = webClient.ResponseHeaders[ HttpResponseHeader.SetCookie ];

                if ( string.IsNullOrEmpty( cookie ) )
                {
                    return false;
                }

                string newCookie = string.Empty;
                string[] 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;
                byte[] thirdResponse = webClient.DownloadData( _addressBookUrl );
                string thirdRes = Encoding.UTF8.GetString( thirdResponse );

                string crumb = string.Empty;
                Regex 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;
                }


                NameValueCollection postDataAB = new NameValueCollection();
                postDataAB.Add( ".crumb", crumb );
                postDataAB.Add( "vcp", "import_export" );
                postDataAB.Add( "submit[action_export_yahoo]", "Export Now" );

                webClient.Headers[ HttpRequestHeader.UserAgent ] = _userAgent;
                webClient.Headers[ HttpRequestHeader.Referer ] = _addressBookUrl;

                byte[] FourResponse = webClient.UploadValues( _addressBookUrl, postDataAB );
                string csvData = Encoding.UTF8.GetString( FourResponse );

                string[] 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;
                            list.Add( mailContact );
                        }
                    }
                }

                result = true;
            }
            catch
            {
            }
            return result;
        }
    }
}