title: How to add and use null value in Enum?
body: <p>See below enum contains two members: Test and Production</p>
  
  <pre><code>public enum OTA_HotelInvCountNotifRQTarget
  {      
      Test,      
      Production,
  }
  </code></pre>
  
  <p>I'm looking for the way to add and use Null value in above enum from code like :</p>
  
  <pre><code>inv.Target = OTA_HotelInvCountNotifRQTarget.Null; // Not allowed
  </code></pre>
  
  <p><strong>Update:</strong>
  I do not want to add extra <code>NULL</code> in above enum, I want to make this dynamic because the above enum is auto generated. and should be remain same.</p>
  
  <p>Is there a way to achieve this in a method itself i.e without creating any <code>Class</code> or adding extra <code>Enum</code> value in enum?
  like : <code>inv.Target = OTA_HotelInvCountNotifRQTarget.Null;</code></p>
  
  <p>How can I do this? </p>