using System;

​

public class Program

{

    public static void Main()

    {

        var t = Test.AandB;

        Console.WriteLine((t & Test.A) == Test.A); // 0011 & 0001 =>  0001 == 0001 => true

        Console.WriteLine(t.HasFlag(Test.A)); // same as above

        Console.WriteLine((t & Test.B) == Test.B); // 0011 & 0010 =>  0010 == 0010 => true

        Console.WriteLine(t.HasFlag(Test.B)); // same as above

    }

​

    [Flags]

    public enum Test

    {

        None = 0, // 0000

        A = 1, // 0001

        B = 2, // 0010

        AandB = 3 // 0011

    }

}