http://blog.yslifes.com/archives/918 <-這個網址 按照步驟做
package db;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class jdbcmysql {
private Connection con = null; //Database objects
//連接object
private Statement stat = null;
//執行,傳入之sql為完整字串
private ResultSet rs = null;
//結果集
private PreparedStatement pst = null;
//執行,傳入之sql為預儲之字申,需要傳入變數之位置
//先利用?來做標示
private String dropdbSQL = "DROP TABLE User ";
private String createdbSQL = "CREATE TABLE User (" +
" id INTEGER " +
" , name VARCHAR(20) " +
" , passwd VARCHAR(20))";
private String insertdbSQL = "insert into User(id,name,passwd) " +
"select ifNULL(max(id),0)+1,?,? FROM User";
private String selectSQL = "select * from User ";
public jdbcmysql()
{
try {
Class.forName("com.mysql.jdbc.Driver");
//註冊driver
con = DriverManager.getConnection(
"jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=Big5",
"","");
//取得connection
//jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=Big5
//localhost是主機名,test是database名
//useUnicode=true&characterEncoding=Big5使用的編碼
}
catch(ClassNotFoundException e)
{
System.out.println("DriverClassNotFound :"+e.toString());
}//有可能會產生sqlexception
catch(SQLException x) {
System.out.println("Exception :"+x.toString());
}
}
//建立table的方式
//可以看看Statement的使用方式
public void createTable()
{
try
{
stat = con.createStatement();
stat.executeUpdate(createdbSQL);
}
catch(SQLException e)
{
System.out.println("CreateDB Exception :" + e.toString());
}
finally
{
Close();
}
}
//新增資料
//可以看看PrepareStatement的使用方式
public void insertTable( String name,String passwd)
{
try
{
pst = con.prepareStatement(insertdbSQL);
pst.setString(1, name);
pst.setString(2, passwd);
pst.executeUpdate();
}
catch(SQLException e)
{
System.out.println("InsertDB Exception :" + e.toString());
}
finally
{
Close();
}
}
//刪除Table,
//跟建立table很像
public void dropTable()
{
try
{
stat = con.createStatement();
stat.executeUpdate(dropdbSQL);
}
catch(SQLException e)
{
System.out.println("DropDB Exception :" + e.toString());
}
finally
{
Close();
}
}
//查詢資料
//可以看看回傳結果集及取得資料方式
public void SelectTable()
{
try
{
stat = con.createStatement();
rs = stat.executeQuery(selectSQL);
System.out.println("ID\t\tName\t\tPASSWORD");
while(rs.next())
{
System.out.println(rs.getInt("id")+"\t\t"+
rs.getString("name")+"\t\t"+rs.getString("passwd"));
}
}
catch(SQLException e)
{
System.out.println("DropDB Exception :" + e.toString());
}
finally
{
Close();
}
}
//完整使用完資料庫後,記得要關閉所有Object
//否則在等待Timeout時,可能會有Connection poor的狀況
private void Close()
{
try
{
if(rs!=null)
{
rs.close();
rs = null;
}
if(stat!=null)
{
stat.close();
stat = null;
}
if(pst!=null)
{
pst.close();
pst = null;
}
}
catch(SQLException e)
{
System.out.println("Close Exception :" + e.toString());
}
}
public static void main(String[] args)
{
//測看看是否正常
jdbcmysql test = new jdbcmysql();
test.dropTable();
test.createTable();
test.insertTable("yku", "12356");
test.insertTable("yku2", "7890");
test.SelectTable();
}
}
2016年3月18日 星期五
2016年3月11日 星期五
匯出資料庫到網頁
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "test";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT * FROM `user`";
$result = $conn->query($sql);
if ($result != null) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo "id:" . $row["name"]. $row["passwd"]. "<br>";
}
} else {
echo "0 results";
}
$conn->close();
?>
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "test";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT * FROM `user`";
$result = $conn->query($sql);
if ($result != null) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo "id:" . $row["name"]. $row["passwd"]. "<br>";
}
} else {
echo "0 results";
}
$conn->close();
?>
2016年2月18日 星期四
開JAVA
打開JAVA
import java.sql.Connection;
import java.sql.DriverManager;
public class hyt {
public static void main(String[] args) {
// TODO Auto-generated method stub
Connection c = null;
try {
Class.forName("org.sqlite.JDBC");
c = DriverManager.getConnection("jdbc:sqlite:test.db");
} catch (Exception e) {
System.err.println(e.getClass().getName() + ": " + e.getMessage());
System.exit(0);
}
System.out.println("Opened database successfully");
}
}
2015年12月25日 星期五
資料庫(刪除修改)
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;
using System.Data.OleDb;//**
using System.IO;//**
namespace WindowsFormsApplication7
{
public partial class Form1 : Form
{
private OleDbConnection connection = new OleDbConnection();
OleDbDataAdapter dAdapter;
OleDbCommandBuilder cBuilder;
DataTable dTable = new DataTable();
BindingSource bSource;
private string ID;
public Form1()
{
InitializeComponent();
connection = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\student\Desktop\WindowsFormsApplication7\WindowsFormsApplication7\bin\Debug\test1.mdb");
}
private void Form1_Load(object sender, EventArgs e)
{
dAdapter = new OleDbDataAdapter("select * from person where 識別碼 ", connection);
cBuilder = new OleDbCommandBuilder(dAdapter);
dAdapter.Fill(dTable);
bSource = new BindingSource();
bSource.DataSource = dTable;
dataGridView1.DataSource = bSource;
}
private void button1_Click(object sender, EventArgs e)
{
connection.Open();
OleDbCommand command2 = new OleDbCommand();
command2.Connection = connection;
command2.CommandText = "insert into person (stu_no,name,sex,tel) values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "')";
command2.ExecuteNonQuery();
dAdapter.Fill(dTable);
connection.Close();
}
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
if (e.ColumnIndex == 0)
{
try
{
var Value = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
Value = dataGridView1.Rows[e.RowIndex].Cells["stu_no"].Value;
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string query = "select* from person where stu_no='" + Value.ToString() + "'";
command.CommandText = query;
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
ID = reader["識別碼"].ToString();
textBox1.Text = reader["stu_no"].ToString();
textBox2.Text = reader["name"].ToString();
textBox3.Text = reader["sex"].ToString();
textBox4.Text = reader["tel"].ToString();
}
connection.Close();
}
catch (Exception ex)
{
MessageBox.Show("ERROR" + ex);
}
}
else if (e.ColumnIndex == 1)
{
if (MessageBox.Show("確定刪除此筆資料?", "刪除資料", MessageBoxButtons.YesNo) == DialogResult.Yes)
{
try
{
var Value = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
Value = dataGridView1.Rows[e.RowIndex].Cells["stu_no"].Value;
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.CommandText = "delete from person WHERE stu_no = '" + Value.ToString() + "'";
command.ExecuteNonQuery();
dTable.Clear();
dAdapter.Fill(dTable);
connection.Close();
MessageBox.Show("刪除成功");
}
catch (Exception ex)
{
MessageBox.Show("ERROR" + ex);
}
}
}
}
private void button2_Click(object sender, EventArgs e)
{
dTable.Clear();
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.CommandText = "UPDATE person SET stu_no = '" + textBox1.Text + "'WHERE 識別碼 = " + ID ;
command.ExecuteNonQuery();
dAdapter.Fill(dTable);
}
private void tabPage1_Click(object sender, EventArgs e)
{
}
}
}
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;//**
using System.IO;//**
namespace WindowsFormsApplication7
{
public partial class Form1 : Form
{
private OleDbConnection connection = new OleDbConnection();
OleDbDataAdapter dAdapter;
OleDbCommandBuilder cBuilder;
DataTable dTable = new DataTable();
BindingSource bSource;
private string ID;
public Form1()
{
InitializeComponent();
connection = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\student\Desktop\WindowsFormsApplication7\WindowsFormsApplication7\bin\Debug\test1.mdb");
}
private void Form1_Load(object sender, EventArgs e)
{
dAdapter = new OleDbDataAdapter("select * from person where 識別碼 ", connection);
cBuilder = new OleDbCommandBuilder(dAdapter);
dAdapter.Fill(dTable);
bSource = new BindingSource();
bSource.DataSource = dTable;
dataGridView1.DataSource = bSource;
}
private void button1_Click(object sender, EventArgs e)
{
connection.Open();
OleDbCommand command2 = new OleDbCommand();
command2.Connection = connection;
command2.CommandText = "insert into person (stu_no,name,sex,tel) values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "')";
command2.ExecuteNonQuery();
dAdapter.Fill(dTable);
connection.Close();
}
private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
if (e.ColumnIndex == 0)
{
try
{
var Value = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
Value = dataGridView1.Rows[e.RowIndex].Cells["stu_no"].Value;
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
string query = "select* from person where stu_no='" + Value.ToString() + "'";
command.CommandText = query;
OleDbDataReader reader = command.ExecuteReader();
while (reader.Read())
{
ID = reader["識別碼"].ToString();
textBox1.Text = reader["stu_no"].ToString();
textBox2.Text = reader["name"].ToString();
textBox3.Text = reader["sex"].ToString();
textBox4.Text = reader["tel"].ToString();
}
connection.Close();
}
catch (Exception ex)
{
MessageBox.Show("ERROR" + ex);
}
}
else if (e.ColumnIndex == 1)
{
if (MessageBox.Show("確定刪除此筆資料?", "刪除資料", MessageBoxButtons.YesNo) == DialogResult.Yes)
{
try
{
var Value = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
Value = dataGridView1.Rows[e.RowIndex].Cells["stu_no"].Value;
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.CommandText = "delete from person WHERE stu_no = '" + Value.ToString() + "'";
command.ExecuteNonQuery();
dTable.Clear();
dAdapter.Fill(dTable);
connection.Close();
MessageBox.Show("刪除成功");
}
catch (Exception ex)
{
MessageBox.Show("ERROR" + ex);
}
}
}
}
private void button2_Click(object sender, EventArgs e)
{
dTable.Clear();
connection.Open();
OleDbCommand command = new OleDbCommand();
command.Connection = connection;
command.CommandText = "UPDATE person SET stu_no = '" + textBox1.Text + "'WHERE 識別碼 = " + ID ;
command.ExecuteNonQuery();
dAdapter.Fill(dTable);
}
private void tabPage1_Click(object sender, EventArgs e)
{
}
}
}
2015年12月4日 星期五
資料庫
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// TODO: 這行程式碼會將資料載入 'db1DataSet.DataTable2' 資料表。您可以視需要進行移動或移除。
this.dataTable2TableAdapter.Fill(this.db1DataSet.DataTable2);
// TODO: 這行程式碼會將資料載入 'db1DataSet.DataTable1' 資料表。您可以視需要進行移動或移除。
this.dataTable1TableAdapter.Fill(this.db1DataSet.DataTable1);
// TODO: 這行程式碼會將資料載入 'db1DataSet.record' 資料表。您可以視需要進行移動或移除。
this.recordTableAdapter.Fill(this.db1DataSet.record);
// TODO: 這行程式碼會將資料載入 'db1DataSet.person' 資料表。您可以視需要進行移動或移除。
this.personTableAdapter.Fill(this.db1DataSet.person);
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void tabPage5_Click(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
// If you are not at the end of the list, move to the next item
// in the BindingSource.
if (bindingSource4.Position + 1 < bindingSource4.Count)
bindingSource4.MoveNext();
// Otherwise, move back to the first item.
else
bindingSource4.MoveFirst();
// Force the form to repaint.
this.Invalidate();
//textBox1.DataBindings.Add("Text", bindingSource4, "chinese",true);
}
private void button2_Click(object sender, EventArgs e)
{
// If you are not at the end of the list, move to the next item
// in the BindingSource.
if (bindingSource4.Position - 1 < 0)
bindingSource4.MoveLast();
// Otherwise, move back to the first item.
else
bindingSource4.MovePrevious();
// Force the form to repaint.
this.Invalidate();
//textBox1.DataBindings.Add("Text", bindingSource4, "chinese",true);
}
private void button3_Click(object sender, EventArgs e)
{
textBox1.DataBindings.Add("Text", bindingSource4, "chinese");
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
}
}
}
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// TODO: 這行程式碼會將資料載入 'db1DataSet.DataTable2' 資料表。您可以視需要進行移動或移除。
this.dataTable2TableAdapter.Fill(this.db1DataSet.DataTable2);
// TODO: 這行程式碼會將資料載入 'db1DataSet.DataTable1' 資料表。您可以視需要進行移動或移除。
this.dataTable1TableAdapter.Fill(this.db1DataSet.DataTable1);
// TODO: 這行程式碼會將資料載入 'db1DataSet.record' 資料表。您可以視需要進行移動或移除。
this.recordTableAdapter.Fill(this.db1DataSet.record);
// TODO: 這行程式碼會將資料載入 'db1DataSet.person' 資料表。您可以視需要進行移動或移除。
this.personTableAdapter.Fill(this.db1DataSet.person);
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void tabPage5_Click(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
// If you are not at the end of the list, move to the next item
// in the BindingSource.
if (bindingSource4.Position + 1 < bindingSource4.Count)
bindingSource4.MoveNext();
// Otherwise, move back to the first item.
else
bindingSource4.MoveFirst();
// Force the form to repaint.
this.Invalidate();
//textBox1.DataBindings.Add("Text", bindingSource4, "chinese",true);
}
private void button2_Click(object sender, EventArgs e)
{
// If you are not at the end of the list, move to the next item
// in the BindingSource.
if (bindingSource4.Position - 1 < 0)
bindingSource4.MoveLast();
// Otherwise, move back to the first item.
else
bindingSource4.MovePrevious();
// Force the form to repaint.
this.Invalidate();
//textBox1.DataBindings.Add("Text", bindingSource4, "chinese",true);
}
private void button3_Click(object sender, EventArgs e)
{
textBox1.DataBindings.Add("Text", bindingSource4, "chinese");
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
}
}
}
2015年11月20日 星期五
資料庫
將ACCESS做好的表單處存為副檔名為.mdb的檔案
從V#From1中使用bindingsource連結表單
從V#From1中使用bindingsource連結表單
從V#From1中加入datagridview,將表單內容顯示出來
(工具箱→ bindingSource1→DataSoure→選擇檔案→DataMenber→選擇資料庫
工具箱→dataGridView1→選擇資料來源→bindingSource1)
2015年11月6日 星期五
計算機
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
int z;
float e;
public Form1()
{
InitializeComponent();
}
private void label1_Click(object sender, EventArgs e)
{
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void label3_Click(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
if (label2.Text == "".ToString())
{
float a = float.Parse(textBox1.Text);
label3.Text = a.ToString();
textBox1.Text = "".ToString();
z = 1;
}
else
{
float r = float.Parse(label2.Text);
label3.Text = r.ToString();
z = 1;
}
}
private void button2_Click_1(object sender, EventArgs e)
{
if (label2.Text == "".ToString())
{
float a = float.Parse(textBox1.Text);
label3.Text = a.ToString();
textBox1.Text = "".ToString();
z = 2;
}
else
{
float r = float.Parse(label2.Text);
label3.Text = r.ToString();
z = 2;
}
}
private void button3_Click_1(object sender, EventArgs e)
{
if (label2.Text == "".ToString())
{
float a = float.Parse(textBox1.Text);
label3.Text = a.ToString();
textBox1.Text = "".ToString();
z = 3;
}
else
{
float r = float.Parse(label2.Text);
label3.Text = r.ToString();
z = 3;
}
}
private void button4_Click_1(object sender, EventArgs e)
{
if (label2.Text == "".ToString())
{
float a = float.Parse(textBox1.Text);
label3.Text = a.ToString();
textBox1.Text = "".ToString();
z = 4;
}
else
{
float r = float.Parse(label2.Text);
label3.Text = r.ToString();
z = 4;
}
}
private void label3_Click_1(object sender, EventArgs e)
{
}
private void button5_Click(object sender, EventArgs e)
{
float q = float.Parse(label3.Text),w = float.Parse(textBox1.Text);
if (z==1)
{
label2.Text = (q + w).ToString();
}
if (z == 2)
{
label2.Text = (q - w).ToString();
}
if (z == 3)
{
label2.Text = (q * w).ToString();
}
if (z == 4)
{
label2.Text = (q / w).ToString();
}
textBox1.Text = "".ToString();
label3.Text = "".ToString();
//float r = float.Parse(label2.Text);
//label3.Text = r.ToString();
}
private void button6_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "0";
}
private void button7_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "1";
}
private void button8_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "2";
}
private void button9_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "3";
}
private void button10_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "4";
}
private void button11_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "5";
}
private void button12_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "6";
}
private void button13_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "7";
}
private void button14_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "8";
}
private void button15_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "9";
}
private void button16_Click(object sender, EventArgs e)
{
textBox1.Text = "";
label2.Text = "";
}
private void button17_Click(object sender, EventArgs e)
{
if (label2.Text == "".ToString())
{
float a = float.Parse(textBox1.Text);
textBox1.Text = (1 / a).ToString();
}
else
{
float a = float.Parse(label2.Text);
label2.Text = (1 / a).ToString();
}
}
}
}
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
int z;
float e;
public Form1()
{
InitializeComponent();
}
private void label1_Click(object sender, EventArgs e)
{
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void label3_Click(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
if (label2.Text == "".ToString())
{
float a = float.Parse(textBox1.Text);
label3.Text = a.ToString();
textBox1.Text = "".ToString();
z = 1;
}
else
{
float r = float.Parse(label2.Text);
label3.Text = r.ToString();
z = 1;
}
}
private void button2_Click_1(object sender, EventArgs e)
{
if (label2.Text == "".ToString())
{
float a = float.Parse(textBox1.Text);
label3.Text = a.ToString();
textBox1.Text = "".ToString();
z = 2;
}
else
{
float r = float.Parse(label2.Text);
label3.Text = r.ToString();
z = 2;
}
}
private void button3_Click_1(object sender, EventArgs e)
{
if (label2.Text == "".ToString())
{
float a = float.Parse(textBox1.Text);
label3.Text = a.ToString();
textBox1.Text = "".ToString();
z = 3;
}
else
{
float r = float.Parse(label2.Text);
label3.Text = r.ToString();
z = 3;
}
}
private void button4_Click_1(object sender, EventArgs e)
{
if (label2.Text == "".ToString())
{
float a = float.Parse(textBox1.Text);
label3.Text = a.ToString();
textBox1.Text = "".ToString();
z = 4;
}
else
{
float r = float.Parse(label2.Text);
label3.Text = r.ToString();
z = 4;
}
}
private void label3_Click_1(object sender, EventArgs e)
{
}
private void button5_Click(object sender, EventArgs e)
{
float q = float.Parse(label3.Text),w = float.Parse(textBox1.Text);
if (z==1)
{
label2.Text = (q + w).ToString();
}
if (z == 2)
{
label2.Text = (q - w).ToString();
}
if (z == 3)
{
label2.Text = (q * w).ToString();
}
if (z == 4)
{
label2.Text = (q / w).ToString();
}
textBox1.Text = "".ToString();
label3.Text = "".ToString();
//float r = float.Parse(label2.Text);
//label3.Text = r.ToString();
}
private void button6_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "0";
}
private void button7_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "1";
}
private void button8_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "2";
}
private void button9_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "3";
}
private void button10_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "4";
}
private void button11_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "5";
}
private void button12_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "6";
}
private void button13_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "7";
}
private void button14_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "8";
}
private void button15_Click(object sender, EventArgs e)
{
textBox1.Text = textBox1.Text + "9";
}
private void button16_Click(object sender, EventArgs e)
{
textBox1.Text = "";
label2.Text = "";
}
private void button17_Click(object sender, EventArgs e)
{
if (label2.Text == "".ToString())
{
float a = float.Parse(textBox1.Text);
textBox1.Text = (1 / a).ToString();
}
else
{
float a = float.Parse(label2.Text);
label2.Text = (1 / a).ToString();
}
}
}
}
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