using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.Text;
using?System.Windows.Forms;
using?System.Data.SqlClient;

namespace?LoginDemo
{
????public?partial?class?frmMain?:?Form
????{
????????public?frmMain（）
????????{
????????????InitializeComponent（）;
????????}
????????private?void?Form1_Load（object?sender?EventArgs?e）
????????{
????????????GenValid（）;
????????}
????????private?void?GenValid（）
????????{
????????????string?valid?=?string.Empty;
????????????for?（int?i?=?0;?i?????????????{
????????????????valid?+=?Math.Floor（new?Random（）.NextDouble（）?*?10）.ToString（）;
????????????}
????????????label5.Text?=?valid;
????????}

????????private?void?button1_Click（object?sender?EventArgs?e）
????????{
????????????yonghuming.Clear（）;
????????????mima.Clear（）;
????????????textBox3.Clear（）;

????????????GenValid（）;?????????????//生成新的驗證碼
????????}

????????private?void?button2_Click（object?sender?EventArgs?e）
????????{
????????????this.Close（）;???????????//關閉窗口
????????}
????????private?void?textBox3_Leave（object?sender?EventArgs?e）
????????{
????????????if?（!IsNum（textBox3.Text））
????????????{
????????????????MessageBox.Show（“請輸入正確格式的驗證碼！“）;
????????????????textBox3.SelectAll（）;???????//選中所有輸入文本
????????????????textBox3.Focus（）;???????????//將焦點轉移到文本框中
????????????}
????????}

????????private?bool?IsNum（string?s）
????????{
????????????try
????????????{
????????????????Convert.ToInt32（s）;
????????????}
????????????catch
????????????{???
????????????????return?false;
????????????}
????????????return?true;
????????}
????????
????????private?bool?ValidLength（String?s）
????????{
????????????if（textBox3.Text.Length!=4）
????????????????return?false;
????????????else
????????????????return?true;
????????}

????????private?bool?ValidEmpty（）
????????{
????????????if（（yonghuming.Text==string.Empty）||（mima.Text==string.Empty））
????????????????return?false;
????????????else
????????????????return?true;
????????}

????????private?void?button3_Click（object?sender?EventArgs?e）
????????{
????????????SqlConnection?Con1?=?new?SqlConnection（“Integrated?Security=SSPI;Database=題庫;“）;
????????????SqlCommand?MyCmd?=?new?SqlCommand（）;
????????????MyCmd.Connection?=?Con1;
????????????Con1.Open（）;
????????????MyCmd.CommandText?=?“select?count（*）?from?usermanagement?where?[Code]=“?+?“\‘“?+?mima.Text.Trim（）?+?“\‘and[UserName]=“?+?“\‘“?+?yonghuming.Text.Trim（）?+?“\‘“;
????????????int?X?=?（int）MyCmd.ExecuteScalar（）;
????????????if?（ValidEmpty（））
????????????{
????????????????if?（ValidLength（textBox3.Text））
????????????????{
????????????????????if?（textBox3.Text?==?label5.Text）
????????????????????{
????????????????????????if?（X!=0）
????????????????????????{
????????????????????????????
????????????????????????????//MessageBox.Show（“成功登入！“）;
????????????????????????????Form3?MyForm3?=?new?Form3（）;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????916??2009-04-09?20:10??LoginDemo\LoginDemo.sln

????..A..H.?????39936??2009-05-06?22:49??LoginDemo\LoginDemo.suo

?????文件?????475136??2009-04-23?23:04??LoginDemo\題庫自動系統論文.doc

?????文件????????405??2009-04-11?10:41??LoginDemo\LoginDemo\app.config

?????文件???????3987??2009-04-16?00:34??LoginDemo\LoginDemo\Form1.cs

?????文件???????7592??2009-04-13?19:00??LoginDemo\LoginDemo\Form1.Designer.cs

?????文件???????5814??2009-04-13?19:00??LoginDemo\LoginDemo\Form1.resx

?????文件???????1525??2009-04-23?23:58??LoginDemo\LoginDemo\Form3.cs

?????文件??????14913??2009-04-22?23:40??LoginDemo\LoginDemo\Form3.Designer.cs

?????文件???????5814??2009-04-22?23:40??LoginDemo\LoginDemo\Form3.resx

?????文件??????13797??2009-04-12?00:33??LoginDemo\LoginDemo\Form4.cs

?????文件???????4926??2009-04-12?00:36??LoginDemo\LoginDemo\Form4.Designer.cs

?????文件???????5814??2009-04-11?23:05??LoginDemo\LoginDemo\Form4.resx

?????文件??????11296??2009-04-17?11:31??LoginDemo\LoginDemo\Form5.cs

?????文件??????52529??2009-04-23?23:43??LoginDemo\LoginDemo\Form5.Designer.cs

?????文件???????5814??2009-04-17?11:31??LoginDemo\LoginDemo\Form5.resx

?????文件???????3409??2009-04-12?00:52??LoginDemo\LoginDemo\Form6.cs

?????文件???????7657??2009-04-12?00:52??LoginDemo\LoginDemo\Form6.Designer.cs

?????文件???????5814??2009-04-12?00:52??LoginDemo\LoginDemo\Form6.resx

?????文件???????1371??2009-04-11?22:26??LoginDemo\LoginDemo\Form7.cs

?????文件???????5496??2009-04-10?16:11??LoginDemo\LoginDemo\Form7.Designer.cs

?????文件???????5814??2009-04-10?16:11??LoginDemo\LoginDemo\Form7.resx

?????文件???????1601??2009-04-12?03:24??LoginDemo\LoginDemo\Form8.cs

?????文件???????3721??2009-04-12?02:13??LoginDemo\LoginDemo\Form8.Designer.cs

?????文件???????5814??2009-04-12?02:13??LoginDemo\LoginDemo\Form8.resx

?????文件??????17661??2009-04-23?23:58??LoginDemo\LoginDemo\Form9.cs

?????文件??????39305??2009-04-12?22:58??LoginDemo\LoginDemo\Form9.Designer.cs

?????文件???????6017??2009-04-12?22:57??LoginDemo\LoginDemo\Form9.resx

?????文件???????8082??2009-04-17?20:18??LoginDemo\LoginDemo\LoginDemo.csproj

?????文件????????500??2009-04-11?12:22??LoginDemo\LoginDemo\Program.cs

............此處省略100個文件信息