C# listbox 九九乘法表 10/1

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 label2_Click(object sender, EventArgs e)
        {
        }
        private void textBox4_TextChanged(object sender, EventArgs e)
        {
        }
        private void button1_Click(object sender, EventArgs e)
        {
            int a1, an, n, d, sn;
            a1 = int.Parse(textBox1.Text);
            d = int.Parse(textBox2.Text);
            n = int.Parse(textBox3.Text);
            an = a1 + (n - 1) * d;
            sn = n / 2 * (2 * a1 + (n - 1) * d);
            textBox4.Text = "" + an;
            textBox5.Text = "" + sn;



        }
        private void button2_Click(object sender, EventArgs e)
        {
            int[,] arr1 = new int[10, 10];
            int[,] arr2 = new int[10, 10];
            int[,] arr3 = new int[10, 10];
            int[,] arr4 = new int[10, 10];
            int[,] arr5 = new int[10, 10];
            int[,] arr6 = new int[10, 10];
            int[,] arr7 = new int[10, 10];
            int[,] arr8 = new int[10, 10];
            int[,] arr9 = new int[10, 10];
          
           
            for (int i = 1; i <= 9; i++)
            {
                for (int j = 1; j <= 9; j++)
                {
                    arr1[i, j] = 1 * j;
                    arr2[i, j] = 2 * j;
                    arr3[i, j] = 3 * j;
                    arr4[i, j] = 4 * j;
                    arr5[i, j] = 5 * j;
                    arr6[i, j] = 6 * j;
                    arr7[i, j] = 7 * j;
                    arr8[i, j] = 8 * j;
                    arr9[i, j] = 9 * j;
                }
            }
        
           
           
            for (int i = 1; i <= 9; i++)
            {
                for (int j = 1; j <= 9; j++)
                {
                    Console.WriteLine(+i + "*" + j + "=" + arr1[i, j]);
                    listBox1.Items.Add(+1 + "*" + j + "=" + arr1[i, j]
                        + "        " + 2 + "*" + j + "=" + arr2[i, j]
                        + "       " + 3 + "*" + j + "=" + arr3[i, j]
                        + "      " + 4 + "*" + j + "=" + arr4[i, j]
                        + "       " + 5 + "*" + j + "=" + arr5[i, j]
                        + "       " + 6 + "*" + j + "=" + arr6[i, j]
                        + "          " + 7 + "*" + j + "=" + arr7[i, j]
                        + "         " + 8 + "*" + j + "=" + arr8[i, j]
                        + "        " + 9 + "*" + j + "=" + arr9[i, j]);
                }
            }

        }
    }                               
        }