using System;

//using System.Linq;    

​

public class Program

{

    private static bool Predicate(int i)

    {

        Console.WriteLine("Checking " + i.ToString());

        return i % 2 == 0;

    }

​

    public static void Main(string[] args)

    {

            int[] items = { 1, 2, 3, 4, 5 };

            var filteredItems = items.Where(Predicate);

            var stringItems = filteredItems.Select(i => i.ToString());

            foreach (int item in filteredItems)

            {

                Console.WriteLine(item);

        }

    }

}