title: The type or namespace name 'Timers' does not exist in the namespace 'system'
body: <p>I am getting this error when I am adding 'using System.Timers' in visual studio 2013</p>
  
  <pre><code>using System.Timers;
  </code></pre>
  
  <p>Error:</p>
  
  <blockquote>
    <p>The type or namespace name 'Timers' does not exit in the namespace 'System' (are you missing an assembly reference?) </p>
  </blockquote>