using System;

public class Program

{

    public static void Main()

    {

        // declare rectangular array

        int[,] intArray = new int[3, 2]; // 2D array

        // assign values 

        intArray[0, 0] = 1;

        intArray[0, 1] = 2;

        intArray[1, 0] = 3;

        intArray[1, 1] = 4;

        intArray[2, 0] = 5;

        intArray[2, 1] = 6;

        // OR

        //int[,] intArray = { { 1, 2 }, { 3, 4 }, { 5, 6 } };

        // To fetch a value from a specific placeholder 

        Console.WriteLine(intArray[0, 1]); // return 2

        Console.WriteLine(intArray[2, 1]); // return 6

        Console.WriteLine("\n**********Updated Values**********\n");

        // access a value of an indexed array element by using indexer ([  ]) and then assign a value to it with assignment operator (=). 

        intArray[0, 1] = 20;

        intArray[2, 1] = 60;

        // To fetch a value from a specific placeholder 

        Console.WriteLine(intArray[0, 1]); // return 20

        Console.WriteLine(intArray[2, 1]); // return 60

​

    }

}