using System;

​

public class Program

{

    public static void Main()

    {

        string display = string.Empty;

        int[][] intArray = {new int[]{1, 2}, new int[]{3, 4, 5}, new int[]{6, 7, 8, 9}};

        // Use intArray.GetLength(0) or intArray.Length

        for (int row = 0; row < intArray.GetLength(0); row++)

        {

            for (int column = 0; column < intArray[row].Length; column++)

            {

                display += intArray[row][column].ToString() + " ";

            }

​

            display += "\n";

        }

​

        Console.WriteLine(display);

    }

}