using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        object[][] array = new object[][] {new object[] {1, 2}, new object[] {3, 4}};

        string[] secondDimensionStrings = array.Select(item => item[1].ToString()).ToArray();

        foreach (string a in secondDimensionStrings) {

            Console.WriteLine(a);   

        }

    }

}