title: Click button on html page fetched using HttpWebResponse
body: <p>I have an html page in a whole HttpWebResponse this way:</p>
  
  <pre><code>HttpWebRequest request = (HttpWebRequest)WebRequest.Create(sslServerHost);
  response = (HttpWebResponse)request.GetResponse();
  </code></pre>
  
  <p>When I go to the same URL in a browser, I get a page with two buttons. I need to click one of them:</p>
  
  <pre><code>&lt;form id="confirmationForm" name="confirmationForm" action="/oauth/oauth/authorize"
                    method="post"&gt;
       &lt;input name="user_oauth_approval" value="true" type="hidden"/&gt;
       &lt;button name="authorize" type="submit" class="allow-button"&gt;
            Allow access
       &lt;/button&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>How can I click the button with name "authorize" programmatically using the HttpWebResponse that I got?</p>