Multidimensional Arrays_2

using System;

class FindMaxSumIn
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int m = int.Parse(Console.ReadLine());

        int[,] myMatrix = new int[n, m];
        int maxSum = 0;
        int sum = 0;
        int indexRow = 0;
        int indexCol = 0;
        String inputNumber;
        for (int row = 0; row < n; row++)
        {
            for (int col = 0; col < m; col++)
            {
                Console.Write("matrix[{0},{1}] = ", row, col);
                inputNumber = Console.ReadLine();
                myMatrix[row, col] = int.Parse(inputNumber);
                Console.WriteLine();
            }
        }
        for (int row = 0; row < n - 2; row++)
            for (int col = 0; col < m - 2; col++)
            {

                for (int i = row; i <= row + 2; i++)
                    for (int j = col; j <= col + 2; j++)
                    {
                        sum += myMatrix[i, j];
                    }
                if (sum > maxSum)
                {
                    maxSum = sum;
                    indexRow = row;
                    indexCol = col;
                }
                sum = 0;
            }


        Console.WriteLine(maxSum);
        for (int row = indexRow; row <= indexRow + 2; row++)
        {
            for (int col = indexCol; col <= indexCol + 2; col++)
            {
                Console.Write("{0} ", myMatrix[row, col]);
            }
            Console.WriteLine();
        }
    }
}