Using Enum in C#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

    class Program

    {

        public enum BillType { OPD, IPD, STORE }

        static void Main(string[] args)

        {

            generateInvloce(BillType.IPD);

        }

        public static bool generateInvloce(BillType billType)

        {

            switch (billType)

            {

                case BillType.IPD:

                    Console.WriteLine((int)BillType.IPD);

                    break;

                case BillType.OPD:

                    Console.WriteLine(BillType.OPD.ToString());

                    break;

                case BillType.STORE:

                    Console.WriteLine(BillType.STORE.ToString());

                    break;

                default:

                    break;

            }

            Console.ReadKey();

            return true;

        }

    }

}