using System;

// Allows use of extension methods from the System.Linq namespace

using System.Linq; 

​

public class Program

{

    public static void Main()

    {

        var ints = new int[] {1, 2, 3, 4};

​

        // Call Where() extension method from the System.Linq namespace

        var even = ints.Where(x => x % 2 == 0); 

        // Output the results

        Console.WriteLine(String.Join(",",even));

    }

}