随机数演示（窗体应用程序）

 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 WindowsFormsApplication2
12 {
13     public partial class Form1 : Form
14     {
15         public Form1()
16         {
17             InitializeComponent();
18         }
19 
20         private void button1_Click(object sender, EventArgs e)//确定按钮代码
21         {
22             try
23             {
24                 int num1 = Convert.ToInt32(textBox1.Text);
25                 int num2 = Convert.ToInt32(textBox2.Text);
26                 Random r = new Random();
27                 int i = r.Next(num2, num1+1);
28                 label5.Text = Convert.ToString(i);
29             }
30             catch
31             {
32                 MessageBox.Show("请输入整数");
33             }
34         }
35 
36         private void button2_Click(object sender, EventArgs e)//退出按钮代码
37         {
38             Application.Exit();
39         }
40     }
41 }