3x3矩陣

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
           
            int[,] a = new int[4, 4];
            int[,] b = new int[4, 4];
            int[,] c = new int[4, 4];
            String n, f, g, h, i, j, k, l, m;
            a[1, 1] = int.Parse(textBox1.Text);
            a[1, 2] = int.Parse(textBox2.Text);
            a[1, 3] = int.Parse(textBox3.Text);
            a[2, 1] = int.Parse(textBox4.Text);
            a[2, 2] = int.Parse(textBox5.Text);
            a[2, 3] = int.Parse(textBox6.Text);
            a[3, 1] = int.Parse(textBox7.Text);
            a[3, 2] = int.Parse(textBox8.Text);
            a[3, 3] = int.Parse(textBox9.Text);
            b[1, 1] = int.Parse(textBox10.Text);
            b[1, 2] = int.Parse(textBox11.Text);
            b[1, 3] = int.Parse(textBox12.Text);
            b[2, 1] = int.Parse(textBox13.Text);
            b[2, 2] = int.Parse(textBox14.Text);
            b[2, 3] = int.Parse(textBox15.Text);
            b[3, 1] = int.Parse(textBox16.Text);
            b[3, 2] = int.Parse(textBox17.Text);
            b[3, 3] = int.Parse(textBox18.Text);
            c[1, 1] = a[1, 1] * b[1, 1] + a[1, 2] * b[2, 1] + a[1, 3] * b[3, 1];
            c[1, 2] = a[2, 1] * b[1, 1] + a[2, 2] * b[2, 1] + a[2, 3] * b[3, 1];
            c[1, 3] = a[3, 1] * b[1, 1] + a[3, 1] * b[2, 1] + a[3, 3] * b[3, 1];
            c[2, 1] = a[1, 1] * b[2, 1] + a[1, 2] * b[2, 2] + a[1, 3] * b[3, 2];
            c[2, 2] = a[2, 1] * b[2, 1] + a[2, 2] * b[2, 2] + a[2, 3] * b[3, 2];
            c[2, 3] = a[3, 1] * b[2, 1] + a[3, 2] * b[2, 2] + a[3, 3] * b[3, 2];
            c[3, 1] = a[1, 1] * b[3, 1] + a[2, 1] * b[2, 3] + a[1, 3] * b[3, 3];
            c[3, 2] = a[2, 1] * b[3, 1] + a[2, 2] * b[2, 3] + a[2, 3] * b[3, 3];
            c[3, 3] = a[3, 1] * b[3, 1] + a[3, 2] * b[2, 3] + a[3, 3] * b[3, 3];
            n=Convert.ToString(c[1,1]);
            f=Convert.ToString(c[1,2]);
            g=Convert.ToString(c[1,3]);
            h=Convert.ToString(c[2,1]);
            i=Convert.ToString(c[2,2]);
            j=Convert.ToString(c[2,3]);
            k=Convert.ToString(c[3,1]);
            l=Convert.ToString(c[3,2]);
            m=Convert.ToString(c[3,3]);
            textBox19.Text = n;
            textBox20.Text = f;
            textBox21.Text = g;
            textBox22.Text = h;
            textBox23.Text = i;
            textBox24.Text = j;
            textBox25.Text = k;
            textBox26.Text = l;
            textBox27.Text = m;
           
        }
    }
    }