using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int[] result = new int[]{1,2,3,4,6};

        //using custom comparer

        CustomSort(result); 

        Array.ForEach(result, element => Console.WriteLine(element));

        //using Comparison delegate

        Array.Sort(result, (a,b) => b.CompareTo(a));

        Array.ForEach(result, element => Console.WriteLine(element));

    }

    public class ReverseComparer: IComparer<int>{

        public int Compare(int a, int b){

            return b.CompareTo(a);

        }

    }

    public static void CustomSort(int[] arr){

        Array.Sort(arr,new ReverseComparer());

    }

}