title: C# enum addition
body: <p>I have the following enum:</p>
  <pre><code>public enum LegalShipTypes : byte
  {
      Frigate = 1,
      Cruiser = 2,
      Destroyer = 3,
      Submarine = 4,
      AircraftCarrier = 5
  }
  </code></pre>
  <p>Is there is a way to get the total value of enum in any way? For instance, this would result in (1 + 2 + 3 + 4 + 5) = 15.</p>