title: Enum value as hidden in C#
body: <p>I have an enum and i want to "hide" one of its values (as i add it for future support).
  The code is written in C#.</p>
  
  <pre><code>public enum MyEnum
  {
     ValueA = 0,
  
     ValueB = 1,
  
     Reserved
  }
  </code></pre>
  
  <p>I don't want to allow peoples who use this code to use this values (MyEnum.Reserved).
  Any idea?
  TIA</p>