魔兽教程...

第一个窗体

用户直接点登陆的话就会提示用户名不能为空密码不能为空

没有账号的话只能先注册，点击蓝色摁钮进入下一个窗体

 这里有判断是否为空，注册成功后利用窗体传值，并且打开第一个窗口

把注册的用户名和密码写上去就可以的登陆到这个了

 窗口一代码：

 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.Threading.Tasks;
 9 using System.Windows.Forms;
10 
11 namespace Loging
12 {
13     public partial class Form2 : Form
14     {
15         public  string mile;
16         public  string pwd;
17         public Form2()
18         {
19             InitializeComponent();
20         }
21 
22         private void Form2_Load(object sender, EventArgs e)
23         {
24 
25         }
26 
27         private void button1_Click(object sender, EventArgs e)
28         {
29             Form3 f3=new Form3();
30             
31             if (textBox1.Text == "" || textBox2.Text == "") {
32                 MessageBox.Show("用户名或密码不能为空！", "提示");
33             }
34             else if (textBox1.Text == mile && textBox2.Text ==pwd)
35             { 
36             
37             Form1 f1=new Form1();
38             f1.Show();
39             }
40 
41         }
42 
43         private void pictureBox1_Click(object sender, EventArgs e)
44         {
45             this.Close();
46         }
47 
48         private void label4_Click(object sender, EventArgs e)
49         {
50             Form3 f3 = new Form3();
51             f3.Show();
52         }
53     }
54 }

代码

 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.Threading.Tasks;
 9 using System.Windows.Forms;
10 
11 namespace Loging
12 {
13     public partial class Form3 : Form
14     {
15       
16         public Form3()
17         {
18             InitializeComponent();
19         }
20         public static string mile;
21         public static string pwd;
22         private void lbls_Click(object sender, EventArgs e)
23         {
24 
25         }
26 
27         private void lblpwd_Click(object sender, EventArgs e)
28         {
29 
30         }
31 
32         private void button1_Click(object sender, EventArgs e)
33         {
34             if (textBox1.Text == "")
35             {
36                 MessageBox.Show("姓名不能为空", "提示");
37 
38             }
39             else if (textBox3.Text == "") {
40                 MessageBox.Show("身份证号不能为空", "提示");
41             }
42             else if (textBox2.Text == "") {
43 
44                 MessageBox.Show("邮箱地址不能为空", "提示");
45             }
46             else if (textBox4.Text == "")
47             {
48                 MessageBox.Show("密码不能为空", " 提示");
49             }
50             else if (textBox5.Text == "") {
51                 MessageBox.Show("请再次输入邮箱", "提示");
52             }
53             else if (textBox6.Text == "")
54             {
55                 MessageBox.Show("请再次输入密码", "提示");
56             }
57             else {
58                 
59                 MessageBox.Show("注册成功", "提示");
60                
61                 Form2 f2 = new Form2();
62                 f2.mile = textBox2.Text;
63                 f2.pwd = textBox4.Text;
64                 f2.Show();
65             }
66         }
67 
68         private void button2_Click(object sender, EventArgs e)
69         {
70             this.Close();
71         }
72 
73         private void Form3_Load(object sender, EventArgs e)
74         {
75 
76         }
77 
78     }
79 }

窗口三代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Loging
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}