using System;

using System.ComponentModel;

public class Program

{

    [Flags]

    public enum ServiceOfferingType

    {

        None = 0x0,

​

        [Description("GOLD")]

        GOLD = 0x1,

​

        [Description("REGULAR")]

        REGULAR = GOLD << 1,

​

        [Description("BASIC")]

        BASIC = GOLD << 2,

​

        [Description("OTHER")]

        OTHER = GOLD << 3,

​

        [Description("")]

        Empty = GOLD << 4,

        ALL_BUT_GOLD = REGULAR | BASIC | OTHER | Empty,

    }

    public static void Main()

    {

        var allButGold = ServiceOfferingType.BASIC | ServiceOfferingType.Empty | ServiceOfferingType.OTHER | ServiceOfferingType.REGULAR;

        //var allButGold = ServiceOfferingType.None;

        //foreach (ServiceOfferingType serviceType in Enum.GetValues(typeof(ServiceOfferingType)))

        //{

//          if (serviceType != ServiceOfferingType.GOLD)

                //allButGold |= serviceType;

        //}

        Console.WriteLine(allButGold);

    }

}