title: Backgroundworker doesn't find a symbol
body: <p>Please I cant find a symbol BackgroundWorker in my application Net 3.5 (Smart device). I find it just in WPF.</p>
  
  <p>I tried to download but I did not find a link</p>
  
  <pre><code>using System.ComponentModel;
  &lt;p style="red"&gt;BackgroundWorker&lt;/p&gt; 
  myWorker = new &lt;p style="red"&gt;BackgroundWorker&lt;/p&gt;();
  </code></pre>