using System;

public class Program

{

    public static void Main()

    {

        var allFives = (int)PaginatorOptions.Batch05 + (int)PaginatorOptions.Payment05;

        allFives = allFives.SetFlag(PaginatorOptions.Batch20);

        Console.WriteLine(allFives.HasFlag(PaginatorOptions.Batch20));

        var hasFlag05 = ((PaginatorOptions)allFives).HasFlag(PaginatorOptions.Batch05);

        var hasFlagPayment20 = ((PaginatorOptions)allFives).HasFlag(PaginatorOptions.Payment20);

        Console.WriteLine(allFives);

        Console.WriteLine(hasFlag05);

        Console.WriteLine(hasFlagPayment20);

    }

}

​

[Flags]

public enum PaginatorOptions {

    Batch05 = 0,

    Batch10 = 1,

    Batch15 = 2,

    Batch20= 4,

    Payment05 = 8,

    Payment10 = 16,

    Payment15 = 32,

    Payment20= 64

}

​

public static class BitwiseExtension  {

    public static bool HasFlag(this int flags, PaginatorOptions newValue) {

        return ((PaginatorOptions)flags).HasFlag(newValue);

    }

​

    public static int SetFlag(this int flags, PaginatorOptions newValue){

        return flags + (int)newValue;

    }

    public static int RemoveFlag(this int flags, PaginatorOptions newValue){

        return flags - (int)newValue;

    }

​

}