using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace NewFeatures4
    {
    class OptionalParameters
        {//Optional Parameters
        static void Main(string[] args)
            {
            ArrayList myArrayList = new ArrayList();
            //Call method but do not pass all parameters
            Process("foo"); //Valid
            Process("foo", true); //Valid
            Process("foo", true, myArrayList); //Valid
            //Process("foo", myArrayList); //Invalid
            Console.ReadLine();
            }

        static void Process(string data, bool ignoreWS = false, ArrayList moreData = null)
            {
            // Actual work done here
            Console.WriteLine(data);
            }
        }
    }