title: Initialize enum with a null value
body: <p>How do i create an enum with a null value</p>
  
  <p>ex:</p>
  
  <pre><code>public enum MyEnum
  {
      [StringValue("X")]
      MyX,
      [StringValue("Y")]
      MyY,      
      None
  }
  </code></pre>
  
  <p>where None value is null or String.Empty</p>