登录界面设计及代码设计

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1、登录界面：usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Windows.Forms;usingSystem.Data.SqlClient;namespace_123{publicpartialclasslogin:Form{publiclogin(){InitializeCom

2、ponent();}privatevoidquxaio_Click(objectsender,EventArgse){MessageBox.Show("确定退出吗？");this.Close();}privatevoiddenglu_Click(objectsender,EventArgse){if(this.zhanghao.Text.Trim()==""

3、this.mima.Text.Trim()==""){if(this.zhanghao.Text.Trim()==""){MessageBox.Show("帐号不能为空！请从洙新

4、输入！");}elseif(this.mima.Text.Trim()==""){MessageBox.Show("密码不能为空！请从新输入！");}}else{stringConnStr=@"server=.;database=user_db;uid=sa;pwd=zhangrui;";SqlConnectionconn=newSqlConnection(ConnStr);conn.Open();stringsql="select*fromtb_userwhereusername='"+this.zhanghao.Text.Trim

5、()+"'andpaswd='"+this.mima.Text.Trim()+"'";SqlCommandcmd=newSqlCommand(sql,conn);SqlDataReaderread=cmd.ExecuteReader();if(read.Read()){//MessageBox.Show("登录成功");menuMenu=newmenu();Menu.ShowDialog(this);this.Hide();}else{MessageBox.Show("用户名或密码错误,请从洙新输入!");read.Close();c

6、md.Clone();conn.Close();}}}}}