using System;

public static class IntExtensions

{

    public static void Times(this int i, Action<int> func)

    {

        for(int j = 0; j < i; j++)

        {

            func(j);

        }

    }

}

​

public class Program

{

    public static void Main()

    {

        5.Times(i => Console.Write("{0} ", i));

    }

}