using System;

public class  MatrixMultiplicationDemo  

{  

    public static void Main(string[] args)  

    {  

         int m = 3, n = 3, p = 3, q = 3, i, j;

         int[,] a = {{1, 4, 2}, {2, 5, 1},{1, 2, 1}};

         int[,] b = {{3, 4, 2}, {3, 5, 7}, {1, 2, 1}};

         Console.WriteLine("Matrix a:");

         for (i = 0; i < m; i++) {

            for (j = 0; j < n; j++) {

               Console.Write(a[i, j] + " ");

            }

            Console.WriteLine();

         }

         Console.WriteLine("Matrix b:");

         for (i = 0; i < p; i++) {

            for (j = 0; j < q; j++) {

               Console.Write(b[i, j] + " ");

            }

            Console.WriteLine();

         }

         if(n != p) {

            Console.WriteLine("Matrix multiplication not possible");

         } else {

            int[,] c = new int[m, q];

            for (i = 0; i < m; i++) {

               for (j = 0; j < q; j++) {

                  c[i, j] = 0;

                  for (int k = 0; k < n; k++) {

                     c[i, j] += a[i, k] * b[k, j];

                  }

               }

            }

            Console.WriteLine("The product of the two matrices is :");

            for (i = 0; i < m; i++) {

               for (j = 0; j < n; j++) {

                  Console.Write(c[i, j] + "\t");

               }

               Console.WriteLine();

            }

         }

      }

}

​