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enum <enum_name> {enumeration list};

enum Days {Sun, Mon, tue, Fir, sat};

using System;
namespace EnumApplication
{
    class EnumProgram
    {
        enum Days { Sun, Mon, tue, Wed, thu, Fri, sat };

        static void Main(string[] args)
        {
            int WeekdayStart = (int)Days.Mon;
            int WeekdayEnd = (int)Days.Fir;
            Console.WriteLine("Monday: {0}", WeekdayStart);
            Console.WriteLine("Friday: {0}", WeekdayEnd);
            Console.ReadKey();
        }
    }
}

///<summary>
/// Permission Enum
///</summary>
[Flags]
public enum Permission
{
    Unknown = 0, // Can also be written as 0x00 or 0
    Create = 1 << 0, // 0x01 or 1
    Read = 1 << 1, // 0x02 or 2
    Update = 1 << 2, // 0x04 or 4
    Delete = 1 << 3 // 0x08 or 8
}

// 1. Grant user create, read, update, and delete permissions
var permission = Permission.Create | permission.Read | permission.Update | permission.Delete;

// 2. Remove user's update and delete permissions
permission = permission & ~permission.Update;
permission = permission & ~permission.Delete;

// 3. Grant user update permission
permission = permission | permission.Update;

// 4. Check if user has create permission
var isCreate = (permission & permission.Create) != 0;
// or
var isCreate = (permission & permission.Create) == permission.Create;