using System;

using System.Collections.Generic;

using System.Linq;  

​

public class Program

{

        public void Main()

        {

            Program.Try(Program.HandleArray1, "array.where");

            Program.Try(Program.HandleArray2, "array.where.orderby");

            Program.Try(Program.HandleList1, "list.where");

            Program.Try(Program.HandleList2, "list.where.orderby");

        }

​

        private static void Try(Action action, string text)

        {

            Console.WriteLine(text);

​

            try

            {

                action.Invoke();

            }

            catch (InvalidOperationException)

            {

                Console.WriteLine("Invalid operation");

            }

​

            Console.WriteLine();

            Console.WriteLine();

        }

​

        private static void HandleArray1()

        {

            IList<int> arr = new[] { 1, 2, 3, 4, 5 };

            var enumerable = arr.Where(item => item > 2);

​

            foreach (var item in enumerable)

            {

                arr[3] = 0;

​

                Console.WriteLine(item);

            }

        }

​

        private static void HandleArray2()

        {

            IList<int> arr = new[] { 1, 2, 3, 4, 5 };

            var orderedEnumerable = arr.Where(item => item > 2).OrderBy(asd => asd);

​

            foreach (var item in orderedEnumerable)

            {

                arr[3] = 0;

​

                Console.WriteLine(item);

            }

        }

​

        private static void HandleList1()

        {

            IList<int> list = new List<int> { 1, 2, 3, 4, 5 };

            var enumerable = list.Where(item => item > 2);

​

            foreach (var item in enumerable)

            {

                list[3] = 0;

​

                Console.WriteLine(item);

            }

        }

​

        private static void HandleList2()

        {

            IList<int> list = new List<int> { 1, 2, 3, 4, 5 };

            var orderedEnumerable = list.Where(item => item > 2).OrderBy(asd => asd);

​

            foreach (var item in orderedEnumerable)

            {

                list[3] = 0;

​

                Console.WriteLine(item);

            }

        }

}