1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Windows.Forms;
 9 
10 namespace 书店管理系统
11 {
12     public partial class Form_login : Form
13     {
14         public Form_login()
15         {
16             InitializeComponent();
17         }
18 
19 
20         int loginCount = 0;//登录次数
21         private void Form1_Load(object sender, EventArgs e)
22         {
23             
24 
25         }
26 
27         private void button_ok_Click(object sender, EventArgs e)
28         {
29             loginCount++;//自增，记录登录次数
30             //根据用户名与密码进行判断
31             if (textBox_username.Text == "admin" && textBox_password.Text == "admin")
32             {
33                 // MainForm.userName = userNameCoboBox.text;
34                 this.DialogResult = DialogResult.OK;
35             }
36             else//！！千万别忘记else这对外部的｛｝号，之前忘记了，肯定转不过去的
37             {
38                 if (loginCount < 3)
39                 {
40                     MessageBox.Show("用户名与密码不一致，您还有" + (3 - loginCount).ToString() + "次机会！", "登陆提示");
41 
42                 }
43                 this.DialogResult = DialogResult.No;
44             }
45             
46         }
47 
48         private void button_clear_Click(object sender, EventArgs e)
49         {
50             this.Close();
51         }
52 
53        
54        
55     }
56 }