title: C# using System.Windows.Forms does not exist
body: <p>I tried to add:</p>
  
  <pre><code>using System.Windows.Forms 
  </code></pre>
  
  <p>But its shows me an error.</p>
  
  <p>I know I must assembly that to my VS2012 but I srsly don't know how. I was searching everywhere and tried everything I've found but none of this helps me.</p>
  
  <p>@edit
  1 hour of searching in the web and... 2 minutes after write this post i found...
  Project >> add Reference...</p>
  
  <p>Solved :]</p>