title: How to use Stream.CopyTo on .NET Framework 3.5?
body: <p>I found upload code and this code contains the <code>Stream.CopyTo</code> method.</p>
  
  <p>Example:</p>
  
  <pre><code>  file.Stream.CopyTo(requestStream); // .NET Framework 4.0
  </code></pre>
  
  <p>How can I copy "file.Stream" to "requestStream"?</p>