using System;

public class Program

{

    static int [,] matrix = {

        {1,2,3},

        {4,5,6},

        {7,8,9} 

    };

​

    public static void Main()

    {

        foreach (int item in matrix)

        {

            Console.Write(item +" ");   

        }       

        Console.WriteLine("\n This is our 2D array printed using nested for loop");

        // Nested for loop

        // outer for loop

        for(int i =0; i< matrix.GetLength(0); i++)

        {

            // inner for loop

            for(int j =0; j< matrix.GetLength(0); j++)

            {

                if ((matrix[i,j] % 2) == 0)

                {

                    Console.Write(matrix[i,j] + " ");

                }

            }

        }

        Console.WriteLine("\n Diagonal One");

        for(int i =0; i< matrix.GetLength(0); i++)

        {

            Console.Write(matrix[i,i] + " ");

        }

        Console.WriteLine("\n Diagonal Two");

        for(int i =0, j=2; i< matrix.GetLength(0); i++, j--)

        {

            Console.Write(matrix[i,j] + " ");

        }

    }

}