title: Can't get web html code: System.Net.WebException: 'The remote server returned an error: (403) Forbidden.
body: <p>My problem is that I can't get specific website html code and I get this error: 
  'System.Net.WebException: 'The remote server returned an error: (403) Forbidden.'</p>
  
  <p>My code is simple:</p>
  
  <pre><code>using (WebClient client = new WebClient())
          {
              string htmlCode = client.DownloadString("http://isbnsearch.org/isbn/");
              MessageBox.Show(htmlCode);
          }
  </code></pre>
  
  <p>When I try using other website like Google everything works perfectly, but with this website I can't reach it.</p>
  
  <p>Is there any solution to fix this?
  Thanks</p>