using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var bitArray = new System.Collections.BitArray(

            new [] { true, true, false, false, false, false, false, false });

        var eventMessages = (EventMessageTypes)bitArray.Cast<Boolean>().Reverse().Aggregate(0, (agg, b) => (agg << 1) + (b ? 1 : 0));

        Console.WriteLine(eventMessages);

    }

}

​

[Flags]

public enum EventMessageTypes

{

    None = 0,

    aaa = 1,

    bbb = 2,

    ccc = 4,

    ddd = 8,

    eee = 16,

    fff = 32,

    All = aaa | bbb | ccc | ddd | eee | fff // All Events

}