class Program
    {
        public static void Main()
        {
            var AllowedColors = MyColors.Red | MyColors.Green | MyColors.Blue;

            Console.WriteLine((AllowedColors & MyColors.Green) == MyColors.Green);//true
            Console.WriteLine((AllowedColors & MyColors.Green) == MyColors.Red); //false
            Console.WriteLine("");

        }

        public enum MyColors
        {
            Yellow = 1,
            Green = 2,
            Red = 4,
            Blue = 8
        }

    }