1  
 2 
 3 静态用户名和密码的登录练习
 4 
 5 private void button2_Click(object sender, EventArgs e)   
 6 {
 7 
 8 textUser.Text = Convert.ToString(textUser.Text);
 9 textBox2.Text = textBox2.Text.ToString();
10 if (textUser.Text == "admin" && textBox2.Text == "111111")
11 {
12 MessageBox.Show("登录成功");
13 }
14 else
15 {
16 MessageBox.Show("用户名或密码错误");
17 }
18 
19 }
20 
21  
22 
23 窗体关闭消息提示的练习
24 
25 private void Form2_FormClosing(object sender, FormClosingEventArgs e)
26 {
27 DialogResult re = MessageBox.Show("确定关闭？","消息",MessageBoxButtons.YesNo);//是否关闭消息提示框
28 if (re == DialogResult.No)
29 {
30 e.Cancel = true; //关闭
31 }
32 else
33 {
34 e.Cancel = false; //不关闭
35 }
36 }
37 
38