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.SqlClient;

namespace?LoginDemo
{
????public?partial?class?frmLogin?:?Form
????{
????????///?

????????///?用戶名
????????///?

????????public?static?string?M_str_name;
????????///?

????????///?用戶密碼
????????///?

????????public?static?string?M_str_password;
???????
????????public?frmLogin（）
????????{
????????????InitializeComponent（）;
????????}

????????private?void?btnExit_Click（object?sender?EventArgs?e）
????????{
????????????Application.Exit（）;
????????}

????????private?void?btnLogin_Click（object?sender?EventArgs?e）
????????{
????????????string?sql?=?“select?*?from?tb_user?where?username=‘“+cmbUserName.Text+“‘?and?userpassword=‘“+txtUserPassword.Text+“‘“;
????????????SqlDataReader?sqlread?=?baseClass.baseOperate.getread（sql）;
????????????sqlread.Read（）;
????????????if?（sqlread.HasRows）
????????????{
????????????????M_str_name?=?cmbUserName.Text;
????????????????M_str_password?=?txtUserPassword.Text;
????????????????frmMain?fmain?=?new?frmMain（）;
????????????????this.Hide（）;
????????????????fmain.Show（）;
????????????}
????????????else
????????????{
????????????????MessageBox.Show（“用戶名或密碼錯誤！““提示“MessageBoxButtons.OKMessageBoxIcon.Information）;
????????????????txtUserPassword.Text?=?““;
????????????????cmbUserName.Text?=?““;
????????????????cmbUserName.Focus（）;
????????????}
????????????sqlread.Close（）;
?????????
????????}

????????private?void?frmLogin_Load（object?sender?EventArgs?e）
????????{
????????????DataSet?ds?=?new?DataSet（）;
????????????ds?=?baseClass.baseOperate.getds（“select?*?from?tb_user“）;
????????????cmbUserName.DataSource?=?ds.Tables[0];
????????????cmbUserName.DisplayMember?=?“username“;
????????}


????}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2012-10-29?23:55??login\
?????目錄???????????0??2012-10-29?23:55??login\LoginDemo\
?????文件?????????917??2011-05-07?21:36??login\LoginDemo.sln
?????目錄???????????0??2012-10-29?23:55??login\LoginDemo\baseClass\
?????文件????????2723??2011-05-19?19:16??login\LoginDemo\baseClass\baseOperate.cs
?????文件????????2000??2011-05-11?21:21??login\LoginDemo\Form1.cs
?????文件????????5846??2011-05-11?21:20??login\LoginDemo\Form1.Designer.cs
?????文件????????7264??2011-05-11?21:20??login\LoginDemo\Form1.resx
?????文件????????1844??2011-05-11?21:48??login\LoginDemo\frmMain.cs
?????文件????????9132??2011-05-11?21:35??login\LoginDemo\frmMain.Designer.cs
?????文件????????5814??2011-05-11?21:35??login\LoginDemo\frmMain.resx
?????文件????????4387??2011-05-07?22:50??login\LoginDemo\LoginDemo.csproj
?????文件?????????493??2011-05-07?21:37??login\LoginDemo\Program.cs
?????目錄???????????0??2012-10-29?23:55??login\LoginDemo\Properties\
?????文件????????1374??2011-05-07?21:36??login\LoginDemo\Properties\AssemblyInfo.cs
?????文件????????3649??2011-05-07?21:41??login\LoginDemo\Properties\Resources.Designer.cs
?????文件????????6737??2011-05-07?21:41??login\LoginDemo\Properties\Resources.resx
?????文件????????1094??2011-05-07?21:36??login\LoginDemo\Properties\Settings.Designer.cs
?????文件?????????249??2011-05-07?21:36??login\LoginDemo\Properties\Settings.settings
?????目錄???????????0??2012-10-29?23:55??login\LoginDemo\Resources\
?????文件?????????269??2011-05-07?21:41??login\LoginDemo\Resources\btnExit.Image.png
?????文件?????????195??2011-05-07?21:41??login\LoginDemo\Resources\btnLogin.Image.png
?????文件???????28588??2011-05-07?21:40??login\LoginDemo\Resources\系統登錄頁面.jpg