2017年11月30日 C#TreeNode递归&邮箱验证&新用户窗体

  private void button1_Click(object sender, EventArgs e)
        {
            dataBind("0001", treeView1.Nodes);
        }

        public void dataBind(string code, TreeNodeCollection tnc)
        {
            foreach (ChinaStates cs in list)
            {
                if (cs.ParentAreaCode == code)
                {
                    TreeNode tn = new TreeNode(cs.AreaName);
                    tn.Tag = cs.AreaCode;

                    dataBind(cs.AreaCode, tn.Nodes);

                    tnc.Add(tn);
                }
            }
        }

        string tname = "";

        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            tname = "";
            getData(treeView1.SelectedNode);
            MessageBox.Show(tname.Substring(0, tname.Length - 3));
        }

        public void getData(TreeNode tn)
        {
            if (tn.Parent != null)
            {
                getData(tn.Parent);
            }
            tname += tn.Text + " | ";
        }

using System.Net;
using System.Net.Mail;

        //创建一个空的字符串
        string a = "";
        private void skinButton1_Click(object sender, EventArgs e)
        {
            //创建服务器对象
            SmtpClient smt = new SmtpClient("这里是域名");
//创建发件人对象
            MailAddress my = new MailAddress("这里是发件人的邮箱");
//创建收件人对象
            MailAddress you = new MailAddress("这里是收件人的邮箱");
//创建邮件的对象,构造函数中传入发件人和收件人
            MailMessage mail = new MailMessage(my, you);//最后扔进这里面去
//设置邮箱标题
            mail.Subject = "这是标题";
//创建随机验证码
            string a1 = "abcdefghigklmnopqrstuvwxyzABCDEFGHIKIMNOPQRSTUVWXYZ0123456789";
            Random b = new Random();
            for (int i = 0; i 4; i++)
            {
                a += a1.Substring(b.Next(0, a1.Length), 1);
            }
//设置邮箱内容
            mail.Body = "验证码为:" + a;
//创建互联网安全证书 
            NetworkCredential nwcd = new NetworkCredential("发件人邮箱", "发件人邮箱的密码");
//将证书绑定到服务器对象上,服务器验证
            smt.Credentials = nwcd;
//发送验证码
            smt.Send(mail);
//判断是否能走到这个地方,走到了就表示发送成功
            MessageBox.Show("发送成功!");
        }

        private void skinButton2_Click(object sender, EventArgs e)
        {

            //利用第二个TextBox判断是否输入的验证码正确
            if (skinTextBox2.Text == a)
            {
                MessageBox.Show("验证成功");
            }
            else
            {
                MessageBox.Show("失败");
            }
        }

 private void timer1_Tick(object sender, EventArgs e)
        {
            time--;
            button2.Text = "发送(" + time.ToString() + ")";

            if (time 0)
            {
                button2.Text = "发送";
                button2.Enabled = true;
                timer1.Enabled = false;
            }
        }