C#做的登录界面包含验证码

登录界面如下所示：

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

namespace 登录
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        static string str1 = "";
        public static void playMusic()
        {
            SoundPlayer player = new SoundPlayer();
            player.SoundLocation = @"C:\Users\xinqiang\Desktop\1.wav";
            player.Play();
        }
        private void login_Click(object sender, EventArgs e)
        {
            string strname = txtName.Text.Trim();
            string strpwd = txtpwd.Text;
            if (rdostudent.Checked || rdoteacher.Checked)
            {
                if (rdostudent.Checked)
                {
                    if (strname == "student" && strpwd == "student")
                    {
                        if (txtvertify.Text.CompareTo(str1) == 0)
                        {
                            MessageBox.Show("登陆成功");
                            playMusic();
                        }
                        else
                            MessageBox.Show("验证码错误");
                    }
                    else
                    {
                        MessageBox.Show("用户名或者密码错误");
                        txtName.Clear();
                        txtpwd.Clear();
                        txtName.Focus();
                    }
                }
                else if (rdoteacher.Checked)
                {
                    if (strname == "teacher" && strpwd == "teacher")
                    {
                        if (txtvertify.Text.CompareTo(str1) == 0)
                        {
                            MessageBox.Show("登陆成功");
                            playMusic();
                        }
                        else
                            MessageBox.Show("验证码错误");
                    }
                    else
                    {
                        MessageBox.Show("用户名或者密码错误");
                        txtName.Clear();
                        txtpwd.Clear();
                        txtvertify.Clear();
                        txtName.Focus();
                    }
                }
            }
            else
            {
                MessageBox.Show("请先选择登录类型");
                txtName.Clear();
                txtpwd.Clear();
                txtvertify.Clear();
                txtName.Focus();
            }
        }

        private void reset_Click(object sender, EventArgs e)
        {
            string strname = txtName.Text.Trim();
            string strpwd = txtpwd.Text;
            txtName.Clear();
            txtpwd.Clear();
            txtvertify.Clear();
            txtName.Focus();
        }
//制作验证码
        private void pictureBox1_Click(object sender, EventArgs e)
        {
            Random r = new Random();
            string str = "";
            for (int i = 0; i < 5; i++)
            {
                str += r.Next(0, 10);
            }
            str1 = string.Copy(str);
            //MessageBox.Show(str);
            Bitmap bmp = new Bitmap(120, 40);
            Graphics g = Graphics.FromImage(bmp);
            //随机生成数字
            for (int i = 0; i < 5; i++)
            {
                Point p = new Point(i * 20, 0);
                string[] fonts = { "微软雅黑", "宋体", "黑体", "隶书", "华文楷体" };
                Color[] cl = { Color.Black, Color.Blue, Color.Red, Color.Green, Color.Yellow };
                g.DrawString(str[i].ToString(), new Font(fonts[r.Next(0, 5)], 20, FontStyle.Bold), new SolidBrush(cl[r.Next(0, 5)]), p);
            }
            //绘制直线识别障碍
            for (int i = 0; i < 20; i++)
            {
                Pen pen = new Pen(Brushes.Black);
                Point p1 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));
                Point p2 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));
                g.DrawLine(pen, p1, p2);
            }
            for (int i = 0; i < 500; i++)
            {
                bmp.SetPixel(r.Next(0, bmp.Width), r.Next(0, bmp.Height), Color.Black);
            }
            //将bmp镶嵌到picturbox中去
            pictureBox1.Image = bmp;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            label3.Text = DateTime.Now.ToString();
            Random r = new Random();
            string str = "";
            for (int i = 0; i < 5; i++)
            {
                str += r.Next(0, 10);
            }
            str1 = string.Copy(str);
            //MessageBox.Show(str);
            Bitmap bmp = new Bitmap(120, 40);
            Graphics g = Graphics.FromImage(bmp);
            //随机生成数字
            for (int i = 0; i < 5; i++)
            {
                Point p = new Point(i * 20, 0);
                string[] fonts = { "微软雅黑", "宋体", "黑体", "隶书", "华文楷体" };
                Color[] cl = { Color.Black, Color.Blue, Color.Red, Color.Green, Color.Yellow };
                g.DrawString(str[i].ToString(), new Font(fonts[r.Next(0, 5)], 20, FontStyle.Bold), new SolidBrush(cl[r.Next(0, 5)]), p);
            }
            //绘制直线识别障碍
            for (int i = 0; i < 20; i++)
            {
                Pen pen = new Pen(Brushes.Black);
                Point p1 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));
                Point p2 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));
                g.DrawLine(pen, p1, p2);
            }
            for (int i = 0; i < 500; i++)
            {
                bmp.SetPixel(r.Next(0, bmp.Width), r.Next(0, bmp.Height), Color.Black);
            }
            //将bmp镶嵌到picturbox中去
            pictureBox1.Image = bmp;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            label3.Text = DateTime.Now.ToString();

        }
    }
}

没有连接数据库