title: Why can't I use the following IEnumerable<string>?
body: <p>I'm getting the following error:</p>
  
  <pre><code>Error   25  The type or namespace name 'IEnumerable' could not be found (are you missing a using directive or an assembly reference?)   C:\Development\Leverage\Leverage\Reports\SurveyLevel.aspx.cs    39  17  Leverage
  </code></pre>
  
  <p>because of this line:</p>
  
  <pre><code>  private IEnumerable&lt;string&gt; GetDateParameters()
  </code></pre>
  
  <p>How do I deal with this? I tried to add in the line:</p>
  
  <blockquote>
  <pre><code>using System.IDisposable
  </code></pre>
  </blockquote>
  
  <p>at the top, but this doesn't fix it.</p>