using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        int a = 100;

        string[] b = new [] {"a", "b", "c"};

        var r = b.Select(x=> {

            a++;

            Console.WriteLine(a);

            return 1;

        });

        Console.WriteLine("before enumeration: {0}", a);

        r.ToArray();

        Console.WriteLine("after enumeration: {0}", a);

        //Console.WriteLine(r);

    }

}