title: Get list all of Category Attribute in enum?
body: <p>I have an enum as below:</p>
  
  <pre><code>public enum DatabaseCommand
  {
       [Category("Connection")]
       Connected= 0,
       [Category("Connection")]
       Disconnected,
       [Category("Connection")]
       GetConnectionStatus,
       [Category("Execute")]
       ExecuteSQLString,
       [Category("Execute")]
       ExecuteSQLStoreProcedure,
       CustomCommand,
  }
  </code></pre>
  
  <p>So, how can I list all of Category Attribute by passing <code>typeof(DatabaseCommand)</code> and return a array of string as below:</p>
  
  <pre><code>"Connection" , "Execute" and "".
  </code></pre>
  
  <p>Any help?
  Thank you!!!</p>