title: how to get html code inside an iframe
body: <p>I have the following problem. I want to retrieve some values from a website. This website doesn't reply unless these values are retrieved from a know source. This known source embeds an iframe for showing these values and is publicly available. Embedding this site within my site using an iframe is one option except there are some decisions to be made within this iframe. 
  Is it possible to write a class library that loads the page (where this single iframe is returned) getting all elements within this iframe, post some values and get the proper results?</p>
  
  <pre><code>Site1/Page ==&gt; Iframe ==&gt;Site2/Page
  </code></pre>
  
  <p>hopefully the question is understandable.</p>
  
  <p>I think that because its possible using a browser and some mouseclicks, it must be possible.</p>