title: Adding an empty value to the enum class
body: <p>Below is the <code>enum</code> class available in my code but, I want to add an empty value to it. After adding empty value to this class I am getting an error. </p>
  
  <pre><code>public enum AgentLevel : int 
  {
  
          [System.Runtime.Serialization.EnumMemberAttribute()]
          Location = 1,
  
          [System.Runtime.Serialization.EnumMemberAttribute(Value="Head Quarter")]
          HeadQuarter = 2,
  }
  </code></pre>