Demo of higher order function in c#

HigherOrderDemo.cs

using System;
using System.Collections.Generic;

namespace HigherOrderProceduresDemo
{
  class Program
  {
    static void Map(IEnumerable<int> list, Action<int> fn)
    {
      foreach (var item in list)
        fn(item);
    }

    static void Main(string[] args)
    {
      void PrintTimes2(int a) => Console.WriteLine((a * 2).ToString());

      var list = new List<int>()
      {
        1,
        2,
        3,
        4,
        5
      };

      Map(list, PrintTimes2);
    }
  }
}