matrixMultiplication

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
            int[,] matrixFirst = {
                                     {1, 2},
                                     {3, 4},
                                     {5, 6},
                                     {7, 8}
                                 };
            int[,] matrixSecond = {
                                      {1, 2, 3},
                                      {4, 5, 6}
                                  };
            int firstRow = matrixFirst.GetLength(0);
            int firstCol = matrixFirst.GetLength(1);
            int secondRow = matrixSecond.GetLength(0);
            int secondCol = matrixSecond.GetLength(1);
            int[,] matrixResult = new int[firstRow, secondCol];
            for (int rows = 0; rows < firstRow; rows++)
            {
                for (int cols = 0; cols < secondCol; cols++)
                {
                    int sum = 0;
                    for (int i = 0; i < firstCol; i++)
                    {
                        sum += matrixFirst[rows, i] * matrixSecond[i, cols];
                    }
                    matrixResult[rows, cols] = sum;
                }
            }
            for (int i = 0; i < matrixResult.GetLength(0); i++)
            {
                for (int j = 0; j < matrixFirst.GetLength(1); j++)
                {
                    Console.Write(matrixResult[i, j] + " ");
                }
                Console.WriteLine();
            }

        }
    }
}