using System;

​

public class Program

{

    [Flags]

    public enum Test

    {

        None = 0,

        Flag1 = 1,

        Flag2 = 2,

        Flag3 = 4,

        Flag4 = 8,

        Flag5 = 16,

    }

    public static void Main()

    {

        // loop 20 times for fun

        for (var i = 0; i < 20; i++)

        {

            // in this test, always testing for existence of Flag4

            Test testFor = Test.Flag4;

            // create a Random from a varying seed

            int seed = (int)DateTime.UtcNow.Ticks;

            var random = new Random(seed * i);

            // use the Random to create a ~random set of Test flags to test against

            Test testAgainst = Test.Flag1;

            // will always include Test.Flag1, along with some other flag enum

            testAgainst |= (Test)random.Next(1, 15);

​

            var result = (testAgainst & testFor);

            // this will return True when testFor is a "compound" flag and at least one of the component flags is found

            var isGood = (result != 0);

            // this will _not_ return True when testFor is a "compound" flag at at least one of the component flags is _not_ found

            var hasFlag = testAgainst.HasFlag(testFor);

            Console.WriteLine("{2} when testing for {0} in ([{1}] aka {3}).", testFor, testAgainst, isGood.ToString().PadRight(5, ' '), (int)testAgainst);

            Console.WriteLine("      Returned {0}.", result);

            Console.WriteLine("      Flagged {0}.", hasFlag);

        }

    }

}

​