get first line multiple and sum second line in two dimensional array of int

iJunior_C#_Lesson_37

using System;

namespace iJuniorPractice
{
    class Program
    {
        static void Main(string[] args)
        {
            int[,] numbers = 
            {
                { 2, 3, 4 }, 
                { 5, 6, 7 },
                { 10, 1, 9 }
            };
            int multipleColumnIndex = 0;
            int sumRowIndex = 1;
            int multiple = 1;
            int sum = 0;        
            int dimensionRowLength = numbers.GetLength(0);
            int dimensionColumnLength = numbers.GetLength(1); 

            for (int i = 0; i < dimensionRowLength; i++)
            {
                multiple *= numbers[i, multipleColumnIndex];
            }
            
            for (int i = 0; i < dimensionColumnLength; i++)
            {
                sum += numbers[sumRowIndex, i];
            }

            Console.WriteLine("Array elements:");
            for (int i = 0; i < dimensionColumnLength * dimensionRowLength; i++)
            {
                Console.Write(numbers[i / dimensionColumnLength, i % dimensionColumnLength] + " ");

                if ((i + 1) % dimensionColumnLength == 0) 
                    Console.WriteLine();
            }

            Console.WriteLine($"Multiple of {multipleColumnIndex + 1} column = {multiple}");
            Console.WriteLine($"Sum of {sumRowIndex + 1} row = {sum}");
        }
    }
}