using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        int[][] arr = new int[][] {new int[2]{10,1}, new int[2]{20,2}, new int[2]{30,3}};

        List<int[]> ascendingOrder = arr.ToList().OrderBy(item => item[1]).ToList();

        List<int[]> descendingOrder = arr.ToList().OrderByDescending(item => item[1]).ToList();

        Console.WriteLine("ascending:");

        ascendingOrder.ForEach(item => Console.WriteLine(String.Join(", " , item)));

        Console.WriteLine('\n' + "descending:");

        descendingOrder.ForEach(item => Console.WriteLine(String.Join(", ", item)));

​

    }

}