Collections demo, C#

Collections demo

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {            
            // Generic
            IList<int> list = new List<int>();            
            list.Add(1);
            Console.WriteLine(list[0]);

ICollection<int> collection = new List<int>();
            collection.Add(2);
            collection.Add(3);
            //Console.WriteLine(collection[0]); //Does not work!
            foreach (int collectioni in collection) {
                Console.WriteLine(collectioni);
            }
            
            IEnumerable<int> enumerable = new List<int>() {4,5};
            //enumerable.Add(6); // Does not work
            foreach (int enumerablei in enumerable) {
                Console.WriteLine(enumerablei);
            }           
        }
    }
}


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