title: Can't create new pen in a new class I created
body: <p>I just made a new class, but I can't seem to create a new Pen or Graphics or whatever...
  I openend a new project, and added a new class. So when I try to type:</p>
  
  <pre><code>Pen mypen = new Pen(Color.Black); 
  </code></pre>
  
  <p>There's an error saying: </p>
  
  <blockquote>
    <p>"The type or namespace name 'Pen' could not be found (are you missing
    a using directive or an assembly reference?)"</p>
  </blockquote>
  
  <p>So what should I do now?</p>