2010/10/29

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
    {
        System.Windows.Forms.Button[] Buttons;
        System.Windows.Forms.TextBox[] TextBoxs;
        int bno;
        int[,] a = new int[4, 4];
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            Buttons = new System.Windows.Forms.Button[9];
            TextBoxs = new System.Windows.Forms.TextBox[9];
            for (int i = 0; i < 9; ++i)
            {
                Buttons[i] = new Button();
                Buttons[i].Click += new System.EventHandler(Buttons_Click);
                this.Controls.Add(Buttons[i]);
                if (i <= 2)
                    Buttons[i].Location = new System.Drawing.Point(10 + i * 80, 10+100);
                else if (i > 2 && i <= 5)
                    Buttons[i].Location = new System.Drawing.Point(10 + (i - 3) * 80, 40+100);
                else if (i > 5 && i <= 9)
                    Buttons[i].Location = new System.Drawing.Point(10 + (i - 6) * 80, 70+100);
                TextBoxs[i] = new TextBox();
                this.Controls.Add(TextBoxs[i]);
                if (i <= 2)
                    TextBoxs[i].Location = new System.Drawing.Point(10 + i * 100, 10);
                else if (i > 2 && i <= 5)
                    TextBoxs[i].Location = new System.Drawing.Point(10 + (i - 3) * 100, 40);
                else if (i > 5 && i <= 9)
                    TextBoxs[i].Location = new System.Drawing.Point(10 + (i - 6) * 100, 70);
             
            }
            TextBoxs[0].Text = "7";
            TextBoxs[1].Text = "2";
            TextBoxs[2].Text = "4";
            TextBoxs[3].Text = "5";
            TextBoxs[4].Text = "0";
            TextBoxs[5].Text = "6";
            TextBoxs[6].Text = "8";
            TextBoxs[7].Text = "3";
            TextBoxs[8].Text = "1";
        }
        public void Buttons_Click(object sender, EventArgs e)
        {
            // System.Windows.Forms.MessageBox.Show("You have clicked button " +
            //   ((System.Windows.Forms.Button)sender).Tag.ToString());
            String tnum = sender.ToString();
            int tlen = tnum.Length;
            string no = tnum.Substring(tlen - 1);
            for (int i = 0; i < 9; i++)
            {
                if (Buttons[i].Text ==no)
                    bno = i;
            }
            switch(bno)
            { case 0:
                   if (Buttons[1].Text == "0")
                   {
                       String temp;
                       temp = Buttons[1].Text;
                       Buttons[1].Text = Buttons[0].Text;
                       Buttons[0].Text = temp;
                   }
                   else if (Buttons[3].Text == "0")
                   {
                       String temp;
                       temp = Buttons[3].Text;
                       Buttons[3].Text = Buttons[0].Text;
                       Buttons[0].Text = temp;
                   }
                   break;
             
                case 1:
                   if (Buttons[0].Text == "0")
                   {
                       String temp;
                       temp = Buttons[0].Text;
                       Buttons[0].Text = Buttons[1].Text;
                       Buttons[1].Text = temp;
                   }
                   else if (Buttons[2].Text == "0")
                   {
                       String temp;
                       temp = Buttons[2].Text;
                       Buttons[2].Text = Buttons[1].Text;
                       Buttons[1].Text = temp;
                   }
                   else if (Buttons[4].Text == "0")
                   {
                       String temp;
                       temp = Buttons[4].Text;
                       Buttons[4].Text = Buttons[1].Text;
                       Buttons[1].Text = temp;
                   }
                   break;
                case 2:
                  if (Buttons[1].Text == "0")
                  {
                      String temp;
                      temp = Buttons[1].Text;
                      Buttons[1].Text = Buttons[2].Text;
                      Buttons[2].Text = temp;
                  }
                  else if (Buttons[5].Text == "0")
                  {
                      String temp;
                      temp = Buttons[5].Text;
                      Buttons[5].Text = Buttons[2].Text;
                      Buttons[2].Text = temp;
                  }
                      break;
                case 3:
                   if (Buttons[0].Text == "0")
                   {
                       String temp;
                       temp = Buttons[0].Text;
                       Buttons[0].Text = Buttons[3].Text;
                       Buttons[3].Text = temp;
                   }
                   else if (Buttons[4].Text == "0")
                   {
                       String temp;
                       temp = Buttons[4].Text;
                       Buttons[4].Text = Buttons[3].Text;
                       Buttons[3].Text = temp;
                   }
                   else if (Buttons[6].Text == "0")
                   {
                       String temp;
                       temp = Buttons[6].Text;
                       Buttons[6].Text = Buttons[3].Text;
                       Buttons[3].Text = temp;
                   }
                   break;
                case 4:
                   if (Buttons[1].Text == "0")
                   {
                       String temp;
                       temp = Buttons[1].Text;
                       Buttons[1].Text = Buttons[4].Text;
                       Buttons[4].Text = temp;
                   }
                   else if (Buttons[3].Text == "0")
                   {
                       String temp;
                       temp = Buttons[3].Text;
                       Buttons[3].Text = Buttons[4].Text;
                       Buttons[4].Text = temp;
                   }
                   else if (Buttons[5].Text == "0")
                   {
                       String temp;
                       temp = Buttons[5].Text;
                       Buttons[5].Text = Buttons[4].Text;
                       Buttons[4].Text = temp;
                   }
                   else if (Buttons[7].Text == "0")
                   {
                       String temp;
                       temp = Buttons[7].Text;
                       Buttons[7].Text = Buttons[4].Text;
                       Buttons[4].Text = temp;
                   }
                        break;
                      case 5:
                   if (Buttons[2].Text == "0")
                   {
                       String temp;
                       temp = Buttons[2].Text;
                       Buttons[2].Text = Buttons[5].Text;
                       Buttons[5].Text = temp;
                   }
                   else if (Buttons[4].Text == "0")
                   {
                       String temp;
                       temp = Buttons[4].Text;
                       Buttons[4].Text = Buttons[5].Text;
                       Buttons[5].Text = temp;
                   }
                   else if (Buttons[8].Text == "0")
                   {
                       String temp;
                       temp = Buttons[8].Text;
                       Buttons[8].Text = Buttons[5].Text;
                       Buttons[5].Text = temp;
                   }
                   break;
                      case 6:
                   if (Buttons[3].Text == "0")
                   {
                       String temp;
                       temp = Buttons[3].Text;
                       Buttons[3].Text = Buttons[6].Text;
                       Buttons[6].Text = temp;
                   }
                   else if (Buttons[7].Text == "0")
                   {
                       String temp;
                       temp = Buttons[7].Text;
                       Buttons[7].Text = Buttons[6].Text;
                       Buttons[6].Text = temp;
                   }
               
                       break;
                      case 7:
                 if (Buttons[4].Text == "0")
                   {
                       String temp;
                       temp = Buttons[4].Text;
                       Buttons[4].Text = Buttons[7].Text;
                       Buttons[7].Text = temp;
                   }
                 else if (Buttons[6].Text == "0")
                 {
                     String temp;
                     temp = Buttons[6].Text;
                     Buttons[6].Text = Buttons[7].Text;
                     Buttons[7].Text = temp;
                 }
                 else if (Buttons[8].Text == "0")
                 {
                     String temp;
                     temp = Buttons[8].Text;
                     Buttons[8].Text = Buttons[7].Text;
                     Buttons[7].Text = temp;
                 }
                   break;
                      case 8:
                   if (Buttons[5].Text == "0")
                   {
                       String temp;
                       temp = Buttons[5].Text;
                       Buttons[5].Text = Buttons[8].Text;
                       Buttons[8].Text = temp;
                   }
                   else if (Buttons[7].Text == "0")
                   {
                       String temp;
                       temp = Buttons[7].Text;
                       Buttons[7].Text = Buttons[8].Text;
                       Buttons[8].Text = temp;
                   }
                     break;
                    }
        }
        private void button1_Click(object sender, EventArgs e)
        {
        
            //input
            a[1, 1] = Convert.ToInt16(TextBoxs[0].Text);
            a[1, 2] = Convert.ToInt16(TextBoxs[1].Text);
            a[1, 3] = Convert.ToInt16(TextBoxs[2].Text);
            a[2, 1] = Convert.ToInt16(TextBoxs[3].Text);
            a[2, 2] = Convert.ToInt16(TextBoxs[4].Text);
            a[2, 3] = Convert.ToInt16(TextBoxs[5].Text);
            a[3, 1] = Convert.ToInt16(TextBoxs[6].Text);
            a[3, 2] = Convert.ToInt16(TextBoxs[7].Text);
            a[3, 3] = Convert.ToInt16(TextBoxs[8].Text);
            //output
           for (int i=0;i<9;++i)
               if (i < 3)
               {
                   Buttons[i].Text = Convert.ToString(a[1, i + 1]);
               }
               else if (i >= 3 && i < 6)
               {
                   Buttons[i].Text = Convert.ToString(a[2,(i-3)+ 1]);
               }
              else
               {
                   Buttons[i].Text = Convert.ToString(a[3, (i-3*2) + 1]);
               }
        }
    }
}
       

2010/10/22(2)

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
    {
        System.Windows.Forms.Button[] Buttons;
        System.Windows.Forms.TextBox[] TextBoxs;
        int[,] a = new int[4, 4];
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            Buttons = new System.Windows.Forms.Button[9];
            TextBoxs = new System.Windows.Forms.TextBox[9];
            for (int i = 0; i < 9; ++i)
            {
                Buttons[i] = new Button();
                Buttons[i].Click += new System.EventHandler(Buttons_Click);
                this.Controls.Add(Buttons[i]);
                if (i <= 2)
                    Buttons[i].Location = new System.Drawing.Point(10 + i * 80, 10+100);
                else if (i > 2 && i <= 5)
                    Buttons[i].Location = new System.Drawing.Point(10 + (i - 3) * 80, 40+100);
                else if (i > 5 && i <= 9)
                    Buttons[i].Location = new System.Drawing.Point(10 + (i - 6) * 80, 70+100);

                TextBoxs[i] = new TextBox();
                this.Controls.Add(TextBoxs[i]);
                if (i <= 2)
                    TextBoxs[i].Location = new System.Drawing.Point(10 + i * 100, 10);
                else if (i > 2 && i <= 5)
                    TextBoxs[i].Location = new System.Drawing.Point(10 + (i - 3) * 100, 40);
                else if (i > 5 && i <= 9)
                    TextBoxs[i].Location = new System.Drawing.Point(10 + (i - 6) * 100, 70);
             
            }

            TextBoxs[0].Text = "7";
            TextBoxs[1].Text = "2";
            TextBoxs[2].Text = "4";
            TextBoxs[3].Text = "5";
            TextBoxs[4].Text = "0";
            TextBoxs[5].Text = "6";
            TextBoxs[6].Text = "8";
            TextBoxs[7].Text = "3";
            TextBoxs[8].Text = "1";
        }
        public void Buttons_Click(object sender, EventArgs e)
        {
            // System.Windows.Forms.MessageBox.Show("You have clicked button " +
            //   ((System.Windows.Forms.Button)sender).Tag.ToString());
            MessageBox.Show("" + sender.ToString());
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //input
            a[1, 1] = Convert.ToInt16(TextBoxs[0].Text);
            a[1, 2] = Convert.ToInt16(TextBoxs[1].Text);
            a[1, 3] = Convert.ToInt16(TextBoxs[2].Text);
            a[2, 1] = Convert.ToInt16(TextBoxs[3].Text);
            a[2, 2] = Convert.ToInt16(TextBoxs[4].Text);
            a[2, 3] = Convert.ToInt16(TextBoxs[5].Text);
            a[3, 1] = Convert.ToInt16(TextBoxs[6].Text);
            a[3, 2] = Convert.ToInt16(TextBoxs[7].Text);
            a[3, 3] = Convert.ToInt16(TextBoxs[8].Text);
            //output
           for (int i=0;i<9;++i)
               if (i < 3)
               {
                   Buttons[i].Text = Convert.ToString(a[1, i + 1]);
               }
               else if (i >= 3 && i < 6)
               {
                   Buttons[i].Text = Convert.ToString(a[2,(i-3)+ 1]);
               }
              else
               {
                   Buttons[i].Text = Convert.ToString(a[3, (i-3*2) + 1]);
               }
        }
    }
}

2010/10/22(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 WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        System.Windows.Forms.Button[] Buttons;
        System.Windows.Forms.TextBox[] textBoxes;
        System.Windows.Forms.TextBox[] TextBoxe;
        int[,] a = new int[5, 5];
        int[,] b = new int[5, 5];
        int[,] c = new int[5, 5];
        int m, n;
          

        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
             textBoxes = new System.Windows.Forms.TextBox[16];
            for (int i = 0; i < 16; i++)
            {
                textBoxes[i] = new TextBox();
                this.Controls.Add(textBoxes[i]);
                if (i <= 3)
                    textBoxes[i].Location = new System.Drawing.Point(10 + i * 100, 10);
                else if (i > 3 && i <= 7)
                    textBoxes[i].Location = new System.Drawing.Point(10 + (i - 4) * 100, 40);
                else if (i > 7 && i <= 11)
                    textBoxes[i].Location = new System.Drawing.Point(10 + (i - 8) * 100, 70);
                else if (i > 11 && i <= 15)
                    textBoxes[i].Location = new System.Drawing.Point(10 + (i - 12) * 100, 100);
            }
            TextBoxe = new System.Windows.Forms.TextBox[16];
            for (int i = 0; i < 16; i++)
            {
                TextBoxe[i] = new TextBox();
                this.Controls.Add(TextBoxe[i]);
                if (i <= 3)
                    TextBoxe[i].Location = new System.Drawing.Point(500 + i * 100, 10);
                else if (i > 3 && i <= 7)
                    TextBoxe[i].Location = new System.Drawing.Point(500 + (i - 4) * 100, 40);
                else if (i > 7 && i <= 11)
                    TextBoxe[i].Location = new System.Drawing.Point(500 + (i - 8) * 100, 70);
                else if (i > 11 && i <= 15)
                    TextBoxe[i].Location = new System.Drawing.Point(500 + (i - 12) * 100, 100);
            }

            Buttons = new System.Windows.Forms.Button[16];
            for (int i = 0; i < 16; i++)
            {
                Buttons[i] = new Button();
                this.Controls.Add(Buttons[i]);
                if (i <= 3)
                    Buttons[i].Location = new System.Drawing.Point(10 + i * 80, 200);
                else if (i > 3 && i <= 7)
                    Buttons[i].Location = new System.Drawing.Point(10 + (i - 4) * 80, 240);
                else if (i > 7 && i <= 11)
                    Buttons[i].Location = new System.Drawing.Point(10 + (i - 8) * 80, 270);
                else if (i > 11 && i <= 15)
                    Buttons[i].Location = new System.Drawing.Point(10 + (i - 12) * 80, 300);
            }
            TextBoxe[0].Text = "1";
            TextBoxe[1].Text = "0";
            TextBoxe[2].Text = "0";
            TextBoxe[3].Text = "0";
            TextBoxe[4].Text = "0";
            TextBoxe[5].Text = "1";
            TextBoxe[6].Text = "0";
            TextBoxe[7].Text = "0";
            TextBoxe[8].Text = "0";
            TextBoxe[9].Text = "0";
            TextBoxe[10].Text = "1";
            TextBoxe[11].Text = "0";
            TextBoxe[12].Text = "0";
            TextBoxe[13].Text = "0";
            TextBoxe[14].Text = "0";
            TextBoxe[15].Text = "1";
            textBoxes[0].Text = "1";
            textBoxes[1].Text = "0";
            textBoxes[2].Text = "0";
            textBoxes[3].Text = "0";
            textBoxes[4].Text = "0";
            textBoxes[5].Text = "1";
            textBoxes[6].Text = "0";
            textBoxes[7].Text = "0";
            textBoxes[8].Text = "0";
            textBoxes[9].Text = "0";
            textBoxes[10].Text = "1";
            textBoxes[11].Text = "0";
            textBoxes[12].Text = "0";
            textBoxes[13].Text = "0";
            textBoxes[14].Text = "0";
            textBoxes[15].Text = "1";
       
        }
        private void button1_Click(object sender, EventArgs e)
        {
             for (int i = 1; i < m; i++)
            {
                for (int j = 1; j < n; j++)
                {
                    for (int k = 1; k < m; k++)
                    {
                        c[i, j] = c[i, j] + a[i, k] * b[k, j];
                    }
                   
                }
            }
            //input
            a[1, 1] = Convert.ToInt16(TextBoxe[0].Text);
            a[1, 2] = Convert.ToInt16(TextBoxe[1].Text);
            a[1, 3] = Convert.ToInt16(TextBoxe[2].Text);
            a[1, 4] = Convert.ToInt16(TextBoxe[3].Text);
            a[2, 1] = Convert.ToInt16(TextBoxe[4].Text);
            a[2, 2] = Convert.ToInt16(TextBoxe[5].Text);
            a[2, 3] = Convert.ToInt16(TextBoxe[6].Text);
            a[2, 4] = Convert.ToInt16(TextBoxe[7].Text);
            a[3, 1] = Convert.ToInt16(TextBoxe[8].Text);
            a[3, 2] = Convert.ToInt16(TextBoxe[9].Text);
            a[3, 3] = Convert.ToInt16(TextBoxe[10].Text);
            a[3, 4] = Convert.ToInt16(TextBoxe[11].Text);
            a[4, 1] = Convert.ToInt16(TextBoxe[12].Text);
            a[4, 2] = Convert.ToInt16(TextBoxe[13].Text);
            a[4, 3] = Convert.ToInt16(TextBoxe[14].Text);
            a[4, 4] = Convert.ToInt16(TextBoxe[15].Text);
            //output
            for (int i = 0; i < 16; ++i)
                if (i < 4)
                {
                    Buttons[i].Text = Convert.ToString(a[1, i + 1]);
                }
                else if (i >= 4 && i < 8)
                {
                    Buttons[i].Text = Convert.ToString(a[2, (i - 4) + 1]);
                }
                else if (i >= 8 && i < 12)
                {
                    Buttons[i].Text = Convert.ToString(a[3, (i - 4* 2) + 1]);
                }
                else
                {
                    Buttons[i].Text = Convert.ToString(a[4, (i - 4 * 3) + 1]);
                }
        }
    }
        }

2010/10/8 3*3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 Form2 : Form
    {
        public Form2()
        {
            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 output;
            a[1,1]=int.Parse (textBox1.Text);
            a[1,2]=int.Parse (textBox3.Text);
            a[1,3]=int.Parse (textBox6.Text);
            a[2,1]=int.Parse (textBox5.Text);
            a[2,2]=int.Parse (textBox2.Text);
            a[2,3]=int.Parse (textBox12.Text);
            a[3,1]=int.Parse (textBox4.Text);
            a[3,2]=int.Parse (textBox7.Text);
            a[3,3]=int.Parse (textBox11.Text);
            b[1, 1] = int.Parse(textBox10.Text);
            b[1, 2] = int.Parse(textBox16.Text);
            b[1, 3] = int.Parse(textBox13.Text);
            b[2, 1] = int.Parse(textBox9.Text);
            b[2, 2] = int.Parse(textBox15.Text);
            b[2, 3] = int.Parse(textBox19.Text);
            b[3, 1] = int.Parse(textBox8.Text);
            b[3, 2] = int.Parse(textBox14.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[1, 1] * b[1, 2] + a[1, 2] * b[2, 2] + a[1, 3] * b[3, 2];
            c[1, 3] = a[1, 1] * b[1, 3] + a[1, 2] * b[2, 3] + a[1, 3] * b[3, 3];
            c[2, 1] = a[2, 1] * b[1, 1] + a[2, 2] * b[2, 1] + a[2, 3] * b[3, 1];
            c[2, 2] = a[2, 1] * b[1, 2] + a[2, 2] * b[2, 2] + a[2, 3] * b[3, 2];
            c[2, 3] = a[2, 1] * b[1, 3] + a[2, 2] * b[2, 3] + a[2, 3] * b[3, 3];
            c[3, 1] = a[3, 1] * b[1, 1] + a[3, 2] * b[2, 1] + a[3, 3] * b[3, 1];
            c[3, 2] = a[3, 1] * b[1, 2] + a[3, 2] * b[2, 2] + a[3, 3] * b[3, 2];
            c[3, 3] = a[3, 1] * b[1, 3] + a[3, 2] * b[2, 3] + a[3, 3] * b[3, 3];
             output= Convert.ToString(c[1,1]);
             textBox28.Text = output;
             output = Convert.ToString(c[1, 2]);
             textBox26.Text = output;
             output = Convert.ToString(c[1, 3]);
             textBox23.Text = output;
             output = Convert.ToString(c[2, 1]);
             textBox24.Text = output;
             output = Convert.ToString(c[2, 2]);
             textBox27.Text = output;
             output = Convert.ToString(c[2, 3]);
             textBox20.Text = output;
             output = Convert.ToString(c[3, 1]);
             textBox25.Text = output;
             output = Convert.ToString(c[3, 2]);
             textBox22.Text = output;
             output = Convert.ToString(c[3, 3]);
             textBox21.Text = output;
          

        }
        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
        }
        private void textBox13_TextChanged(object sender, EventArgs e)
        {
        }
    }
}

2010/10/1

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
    {
        Form2 newform;
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            int a1,an,d,n,sn;
            a1 =int.Parse (textBox1.Text);
            d = int.Parse(textBox2.Text);
            n = int.Parse(textBox3.Text);
           
            an = a1 + (n - 1) * d;
            sn = (a1 + an) * n / 2;
            textBox4.Text =""+an;
            textBox5.Text =""+sn;
        }
        private void label3_Click(object sender, EventArgs e)
        {
        }
        private void label4_Click(object sender, EventArgs e)
        {
        }
        private void label5_Click(object sender, EventArgs e)
        {
        }
        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
           
        }
        private void button2_Click(object sender, EventArgs e)
        {
          
               newform = new Form2();
               newform.Show();
            }
        }
   
}
















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 Form2 : Form
    {
        Form2 newform;
        public Form2()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            int sum = 0;
            int[,] arr1 = new int[82, 82];
            for (int i = 1; i <= 9; i++)
            {
                for (int j = 1; j <= 9; j++)
                {
                    sum = i * j;
                    arr1[i, j] = sum;
                }
            }
            for (int i = 1; i <= 9; i++)
            {
                for (int j = 1; j <= 9; j++)
                {
                    listBox1.Items.Add("" + i + "*" + "" + j + "=" + arr1[i, j]);
                }
            }
        }
        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
          
           
        }
    }
}