internal Link extractor code

List<string> links = new List<string>();</string></string>

private void FindLinks(string url)
{
   links.Clear();

   WebBrowser webBrowser1 = new WebBrowser();
   webBrowser1.Navigate(url);
   webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
}

void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
   

   if (((WebBrowser)sender).Document != null)
   {
      HtmlElementCollection col = ((WebBrowser)sender).Document.GetElementsByTagName("a");

      foreach (HtmlElement elem in col)
      {
         if (elem.GetAttribute("href").StartsWith("http://"))
            links.Add(elem.GetAttribute("href"));
      }
   }
}

FindLinks(@"http://www.google.gr/");