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);
          
                if(no=="2")
                MessageBox.Show("" + no);
        }

遊戲方塊

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
    {
        public Form1()
        {
            InitializeComponent();
        }
        System.Windows.Forms.Button[] Buttons;
        System.Windows.Forms.TextBox[] Textboxe;
        int[,] a = new int[4, 4];
        int bno;
        private void Form1_Load(object sender, EventArgs e)
        {
            Buttons = new System.Windows.Forms.Button[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);
            }
            Textboxe = new System.Windows.Forms.TextBox[9];
            for (int i = 0; i < 9; ++i)
            {
                Textboxe[i] = new TextBox();
                this.Controls.Add(Textboxe[i]);
                if (i <= 2)
                    Textboxe[i].Location = new System.Drawing.Point(10 + i * 100, 10);
                else if (i > 2 && i <= 5)
                    Textboxe[i].Location = new System.Drawing.Point(10 + (i - 3) * 100, 40);
                else if (i > 5 && i <= 9)
                    Textboxe[i].Location = new System.Drawing.Point(10 + (i - 6) * 100, 70);
            }
            Textboxe[0].Text = "7";
            Textboxe[1].Text = "2";
            Textboxe[2].Text = "4";
            Textboxe[3].Text = "5";
            Textboxe[4].Text = "0";
            Textboxe[5].Text = "6";
            Textboxe[6].Text = "8";
            Textboxe[7].Text = "3";
            Textboxe[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;
                    }
                    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[4].Text == "0")
       {
           String temp;
           temp = Buttons[4].Text;
           Buttons[4].Text =Buttons[1].Text;
           Buttons[1].Text = temp;
       }
                    if (Buttons[0].Text == "0")
                    {
                        String temp;
                        temp = Buttons[0].Text;
                        Buttons[0].Text = Buttons[1].Text;
                        Buttons[1].Text = temp;
                    }
                    if (Buttons[2].Text == "0")
                    {
                        String temp;
                        temp = Buttons[2].Text;
                        Buttons[2].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;
                    }
                    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[4].Text == "0")
                    {
                        String temp;
                        temp = Buttons[4].Text;
                        Buttons[4].Text = Buttons[3].Text;
                        Buttons[3].Text = temp;
                    }
                    if (Buttons[0].Text == "0")
                    {
                        String temp;
                        temp = Buttons[0].Text;
                        Buttons[0].Text = Buttons[3].Text;
                        Buttons[3].Text = temp;
                    }
                    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;
                    }
                    if (Buttons[3].Text == "0")
                    {
                        String temp;
                        temp = Buttons[3].Text;
                        Buttons[3].Text = Buttons[4].Text;
                        Buttons[4].Text = temp;
                    }
                    if (Buttons[5].Text == "0")
                    {
                        String temp;
                        temp = Buttons[5].Text;
                        Buttons[5].Text = Buttons[4].Text;
                        Buttons[4].Text = temp;
                    }
                    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[4].Text == "0")
                    {
                        String temp;
                        temp = Buttons[4].Text;
                        Buttons[4].Text = Buttons[5].Text;
                        Buttons[5].Text = temp;
                    }
                    if (Buttons[2].Text == "0")
                    {
                        String temp;
                        temp = Buttons[2].Text;
                        Buttons[2].Text = Buttons[5].Text;
                        Buttons[5].Text = temp;
                    }
                    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;
                    }
                    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;
                    }
                    if (Buttons[6].Text == "0")
                    {
                        String temp;
                        temp = Buttons[6].Text;
                        Buttons[6].Text = Buttons[7].Text;
                        Buttons[7].Text = temp;
                    }
                    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;
                    }
                    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_1(object sender, EventArgs e)
        {
            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[2, 1] = Convert.ToInt16(Textboxe[3].Text);
            a[2, 2] = Convert.ToInt16(Textboxe[4].Text);
            a[2, 3] = Convert.ToInt16(Textboxe[5].Text);
            a[3, 1] = Convert.ToInt16(Textboxe[6].Text);
            a[3, 2] = Convert.ToInt16(Textboxe[7].Text);
            a[3, 3] = Convert.ToInt16(Textboxe[8].Text);
            //輸入 input
            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 - 6) + 1]);
                }
            //輸出 output
        }
    }
}

4*4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
    {
        System.Windows.Forms.TextBox[] textbox1;
        System.Windows.Forms.TextBox[] textbox2;
        System.Windows.Forms.TextBox[] textbox3;
        int[,] a = new int[5, 5];
        int[,] b = new int[5, 5];
        int[,] c = new int[5, 5];

        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            textbox1 = new System.Windows.Forms.TextBox[16];
            for (int i = 0; i < 16; i++)
            {
                textbox1[i] = new TextBox();
                this.Controls.Add(textbox1[i]);
                if (i <= 3)
                    textbox1[i].Location = new System.Drawing.Point(10 + i * 100, 10);
                else if (i > 3 && i <= 7)
                    textbox1[i].Location = new System.Drawing.Point(10 + (i - 4) * 100, 40);
                else if (i > 7 && i <= 11)
                    textbox1[i].Location = new System.Drawing.Point(10 + (i - 8) * 100, 70);
                else if (i > 11 && i <= 15)
                    textbox1[i].Location = new System.Drawing.Point(10 + (i - 12) * 100, 100);
            }
            textbox2 = new System.Windows.Forms.TextBox[16];
            for (int i = 0; i < 16; i++)
            {
                textbox2[i] = new TextBox();
                this.Controls.Add(textbox2[i]);
                if (i <= 3)
                    textbox2[i].Location = new System.Drawing.Point(10 + i * 100, 160);
                else if (i > 3 && i <= 7)
                    textbox2[i].Location = new System.Drawing.Point(10 + (i - 4) * 100, 190);
                else if (i > 7 && i <= 11)
                    textbox2[i].Location = new System.Drawing.Point(10 + (i - 8) * 100, 220);
                else if (i > 11 && i <= 15)
                    textbox2[i].Location = new System.Drawing.Point(10 + (i - 12) * 100, 260);
            }
            textbox3 = new System.Windows.Forms.TextBox[16];
            for (int i = 0; i < 16; i++)
            {
                textbox3[i] = new TextBox();
                this.Controls.Add(textbox3[i]);
                if (i <= 3)
                    textbox3[i].Location = new System.Drawing.Point(10 + i * 100, 300);
                else if (i > 3 && i <= 7)
                    textbox3[i].Location = new System.Drawing.Point(10 + (i - 4) * 100, 330);
                else if (i > 7 && i <= 11)
                    textbox3[i].Location = new System.Drawing.Point(10 + (i - 8) * 100, 360);
                else if (i > 11 && i <= 15)
                    textbox3[i].Location = new System.Drawing.Point(10 + (i - 12) * 100, 390);
            }
           
       
        }
        private void button1_Click(object sender, EventArgs e)
        {
            for (int i = 1; i < 5; i++)
                for (int j = 1; j < 5; j++)
                {
                    for (int k = 1; k < 5; k++)
                    {
                        c[i, j] = c[i, j] + a[i, k] * b[k, j];
                        c[i = 1, j] = c[i = 1, j] + a[1, 1] * b[i, j] + a[1, 2] * b[i + 1, j] + a[1, 3] * b[i + 2, j] + a[1, 4] * b[i + 3, j];
                        c[i = 2, j] = c[i = 2, j] + a[2, 1] * b[i - 1, j] + a[2, 2] * b[i, j] + a[2, 3] * b[i + 1, j] + a[2, 4] * b[i + 2, j];
                        c[i = 3, j] = c[i = 3, j] + a[3, 1] * b[i - 2, j] + a[3, 2] * b[i - 1, j] + a[3, 3] * b[i, j] + a[3, 4] * b[i + 1, j];
                        c[i = 4, j] = c[i = 4, j] + a[4, 1] * b[i - 3, j] + a[4, 2] * b[i - 2, j] + a[4, 3] * b[i - 1, j] + a[4, 4] * b[i, j];
                    }
                }
            //input
            a[1, 1] = Convert.ToInt16(textbox1[0].Text);
            a[1, 2] = Convert.ToInt16(textbox1[1].Text);
            a[1, 3] = Convert.ToInt16(textbox1[2].Text);
            a[1, 4] = Convert.ToInt16(textbox1[3].Text);
            a[2, 1] = Convert.ToInt16(textbox1[4].Text);
            a[2, 2] = Convert.ToInt16(textbox1[5].Text);
            a[2, 3] = Convert.ToInt16(textbox1[6].Text);
            a[2, 4] = Convert.ToInt16(textbox1[7].Text);
            a[3, 1] = Convert.ToInt16(textbox1[8].Text);
            a[3, 2] = Convert.ToInt16(textbox1[9].Text);
            a[3, 3] = Convert.ToInt16(textbox1[10].Text);
            a[3, 4] = Convert.ToInt16(textbox1[11].Text);
            a[4, 1] = Convert.ToInt16(textbox1[12].Text);
            a[4, 2] = Convert.ToInt16(textbox1[13].Text);
            a[4, 3] = Convert.ToInt16(textbox1[14].Text);
            a[4, 4] = Convert.ToInt16(textbox1[15].Text);
            b[1, 1] = Convert.ToInt16(textbox2[0].Text);
            b[1, 2] = Convert.ToInt16(textbox2[1].Text);
            b[1, 3] = Convert.ToInt16(textbox2[2].Text);
            b[1, 4] = Convert.ToInt16(textbox2[3].Text);
            b[2, 1] = Convert.ToInt16(textbox2[4].Text);
            b[2, 2] = Convert.ToInt16(textbox2[5].Text);
            b[2, 3] = Convert.ToInt16(textbox2[6].Text);
            b[2, 4] = Convert.ToInt16(textbox2[7].Text);
            b[3, 1] = Convert.ToInt16(textbox2[8].Text);
            b[3, 2] = Convert.ToInt16(textbox2[9].Text);
            b[3, 3] = Convert.ToInt16(textbox2[10].Text);
            b[3, 4] = Convert.ToInt16(textbox2[11].Text);
            b[4, 1] = Convert.ToInt16(textbox2[12].Text);
            b[4, 2] = Convert.ToInt16(textbox2[13].Text);
            b[4, 3] = Convert.ToInt16(textbox2[14].Text);
            b[4, 4] = Convert.ToInt16(textbox2[15].Text);
          
            for (int i = 1; i < 5; i++)
                for (int j = 1; j < 5; j++)
                {
                    c[i = 1, j] = a[1, 1] * b[i, j] + a[1, 2] * b[i + 1, j] + a[1, 3] * b[i + 2, j] + a[1, 4] * b[i + 3, j];
                    c[i = 2, j] =a[2, 1] * b[i - 1, j] + a[2, 2] * b[i, j] + a[2, 3] * b[i + 1, j] + a[2, 4] * b[i + 2, j];
                    c[i = 3, j] =  a[3, 1] * b[i - 2, j] + a[3, 2] * b[i - 1, j] + a[3, 3] * b[i, j] + a[3, 4] * b[i + 1, j];
                    c[i = 4, j] = a[4, 1] * b[i - 3, j] + a[4, 2] * b[i - 2, j] + a[4, 3] * b[i - 1, j] + a[4, 4] * b[i, j];
                }
            //output
          
           
            for (int i = 0; i < 16; ++i)
                if (i < 4)
                {
                    textbox3[i].Text = Convert.ToString(c[1, i + 1]);
                }
                else if (i >= 4 && i < 8)
                {
                    textbox3[i].Text = Convert.ToString(c[2, (i - 4) + 1]);
                }
                else if (i >= 8 && i < 12)
                {
                    textbox3[i].Text = Convert.ToString(c[3, (i - 4 * 2) + 1]);
                }
                else
                {
                    textbox3[i].Text = Convert.ToString(c[4, (i - 4 * 3) + 1]);
                }

        }
    }
}

3*3 矩陣乘法

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)
        {
            String output;
            int[, ] a = new int[4, 4 ];
            int[, ] b = new int[4, 4 ];
            int[, ] c = new int[4, 4];
            a[1, 1] =int.Parse(textBox1.Text);
            a[1, 2] = int.Parse(textBox4.Text);
            a[1, 3] = int.Parse(textBox7.Text);
            a[2, 1] = int.Parse(textBox2.Text);
            a[2, 2] = int.Parse(textBox5.Text);
            a[2, 3] = int.Parse(textBox8.Text);
            a[3, 1] = int.Parse(textBox3.Text);
            a[3, 2] = int.Parse(textBox6.Text);
            a[3, 3] = int.Parse(textBox9.Text);
            b[1, 1] = int.Parse(textBox10.Text);
            b[1, 2] = int.Parse(textBox13.Text);
            b[1, 3] = int.Parse(textBox16.Text);
            b[2, 1] = int.Parse(textBox11.Text);
            b[2, 2] = int.Parse(textBox14.Text);
            b[2, 3] = int.Parse(textBox17.Text);
            b[3, 1] = int.Parse(textBox12.Text);
            b[3, 2] = int.Parse(textBox15.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]);
            textBox19.Text = output;
            output = Convert.ToString(c[1, 2]);
            textBox22.Text = output;
            output = Convert.ToString(c[1, 3]);
            textBox25.Text = output;
            output = Convert.ToString(c[2,1 ]);
            textBox20.Text = output;
            output = Convert.ToString(c[2, 2]);
            textBox23.Text = output;
            output = Convert.ToString(c[2, 3]);
            textBox26.Text = output;
            output = Convert.ToString(c[3, 1]);
            textBox21.Text = output;
            output = Convert.ToString(c[3, 2]);
            textBox24.Text = output;
            output = Convert.ToString(c[3, 3]);
            textBox27.Text = output;
        }
    }
}

表單-九九乘法表

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[,] array = new int[10, 10];
            for (int i= 1; i<= 9; i++)
            {
                for (int j = 1; j<= 9; j++)
                {
                    array[i, j] = i* j;
                }
            }
            for (int x = 1; x<= 9; x++)
            {
                listBox1.Items.Add("" + x+ "*1=" + array[x, 1] + "  " + x + "*2=" + array[x, 2] + "  " + x+ "*3=" + array[x, 3] + "  " + x + "*4=" + array[x, 4] + "  " + x + "*5=" + array[x, 5] + "  " + x + "*6=" + array[x, 6] + "  " + x+ "*7=" + array[x, 7] + "  " + x + "*8=" + array[x, 8] + "  " + x + "*9=" + array[x,9]);
            }
        }
    }
}