using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var newAbc = new List<int>();

        var abc = new List<int>{1,2,3};

        var a  = abc.Select(x => { x= DoIt(x); return x;} );

        foreach(var i in a){

        Console.WriteLine(i);

        }

        newAbc.Add(abc.Last());

        Console.WriteLine(newAbc.Count());

    }

    public static int DoIt(int x){

    return x+1;

    }

}