C#如何通过QQ邮件发送验证码到指定邮箱

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

public class EmailSender
{
    public void SendEmail(string toAddress, string subject, string body)
    {
        // 设置发件人邮箱地址以及授权码
        string fromAddress = "xxxxx@qq.com";
        string password = "wxxxxxdgtdzhecjb";

        // 创建邮件消息对象
        MailMessage mail = new MailMessage();
        mail.From = new MailAddress(fromAddress);
        mail.To.Add(new MailAddress(toAddress));
        mail.Subject = subject;
        mail.Body = body;

        // 创建SMTP客户端对象，设置SMTP服务器和端口号(这里不用改)
        SmtpClient smtpClient = new SmtpClient("smtp.qq.com", 587);
        smtpClient.UseDefaultCredentials = false;
        smtpClient.Credentials = new NetworkCredential(fromAddress, password);
        smtpClient.EnableSsl = true;

        try
        {
            // 发送邮件
            smtpClient.Send(mail);
            Console.WriteLine("邮件发送成功！");
        }
        catch (Exception ex)
        {
            Console.WriteLine("发送邮件时出现错误： " + ex.Message);
        }
    }
}
public class Test
{
    static int Main(string[] args)
    {
        EmailSender emailSender = new EmailSender();
        emailSender.SendEmail("yyyyyyy@qq.com", "测试邮件", "这是一封测试邮件");//发送地址、邮箱标题、邮箱内容
        return 0;
    }
}