using System;

​

public class Program

{

    static int col = 3;

    static int row = 3;

    static int[, ] arr1 = new int[row, col];

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Random rnd = new Random();

        while (true)

        {

            int random_row = rnd.Next(0, 3); // creates a number between 0 and 2

            int random_col = rnd.Next(0, 3);

            if (arr1[random_row, random_col] != 0)

            {

                arr1[random_row, random_col] = rnd.Next(1, 100);

            }

​

            if (matrixfilled())

            {

                for (row = 0; row < 3; row++)

                {

                    Console.Write("\n");

                    for (col = 0; col < 3; col++)

                    {

                        if (arr1[row, col] == 0)

                            Console.Write("{0}\t", arr1[row, col]);

                    }

​

                    Console.Write("\n\n");

                }

​

                break;

            }

        }

    }

​

    public static bool matrixfilled()

    {

        for (row = 0; row < 3; row++)

        {

            for (col = 0; col < 3; col++)

            {

                Console.Write("{0}\t", arr1[row, col]);

                if (arr1[row, col] == 0)

                {

                    return false;

                }

            }

        }

​

        return true;

    }

}