Array matrix example in C#

We are given a two-dimensional rectangular array (matrix) of integers and to find the sub-matrix of the size of 2 by 2 with a maximum sum of its elements and to print it.

class AddMaxNumber

    {

        static void Main()

        {

            // Declare and initialize the matrix

            int[,] matrix = {

                   { 0, 2, 4, 0, 9, 3 },

                   { 7, 1, 6, 3, 2, 1 },

                   { 1, 3, 5, 8, 5, 6 },

                   { 4, 6, 7, 9, 1, 0 }

        };

            // Find the maximam sum platform of size 2 x 2

            long maxSum = long.MinValue;

            int maxRow = 0;

            int maxCol = 0;

            for (int row = 0; row < matrix.GetLength(0) - 1; row++)

            {

                for (int col = 0; col < matrix.GetLength(1) - 1; col++)

                {

                    long sum = matrix[row, col] + matrix[row, col + 1] +

                        matrix[row + 1, col] + matrix[row + 1, col + 1];

                    if (sum > maxSum)

                    {

                        maxSum = sum;

                        maxRow = row;

                        maxCol = col;

                    }

                }

            }

            // Print the result

            Console.WriteLine("The max matrix platform is:");

            Console.WriteLine("  {0} {1}",

                       matrix[maxRow, maxCol],

                       matrix[maxRow, maxCol + 1]);

            Console.WriteLine("  {0} {1}",

                  matrix[maxRow + 1, maxCol],

           matrix[maxRow + 1, maxCol + 1]);

            Console.WriteLine("The maximam sum is: {0}", maxSum);

            Console.ReadLine();

            }

    }

Output: