using System;

using System.Text;

using System.Collections.Generic;

using System.Linq;

public class Program

{

        public static void Main(string[] args)

        {

            int valueFromDb = 11;

            var result = Enum.GetNames(typeof(WeekDays)).Where(x => (valueFromDb & (int)Enum.Parse(typeof(WeekDays), x)) > 0).ToList();

            Console.WriteLine(string.Join(", ", result));

        }

​

        [Flags]

        public enum WeekDays

        {

            Sun = 1,

​

            Monday = 2,

​

            Tue=4,

​

            Wed = 8,

            Thu = 16,

            Fri = 32,

​

            Sat= 64

        }

​

}