如何在c#中使用smtp发送电子邮件？

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

SmtpClient client = new SmtpClient();
client.Host = "SMTP服务器地址";
client.Port = SMTP服务器端口号;
client.UseDefaultCredentials = false;
client.Credentials = new NetworkCredential("发件人邮箱", "发件人邮箱密码");

MailMessage message = new MailMessage();
message.From = new MailAddress("发件人邮箱");
message.To.Add("收件人邮箱");
message.Subject = "邮件主题";
message.Body = "邮件正文";
message.IsBodyHtml = true; // 如果要发送HTML格式的邮件，设置为true

client.Send(message);

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

namespace EmailSender
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                SmtpClient client = new SmtpClient();
                client.Host = "SMTP服务器地址";
                client.Port = SMTP服务器端口号;
                client.UseDefaultCredentials = false;
                client.Credentials = new NetworkCredential("发件人邮箱", "发件人邮箱密码");

                MailMessage message = new MailMessage();
                message.From = new MailAddress("发件人邮箱");
                message.To.Add("收件人邮箱");
                message.Subject = "邮件主题";
                message.Body = "邮件正文";
                message.IsBodyHtml = true;

                client.Send(message);

                Console.WriteLine("邮件发送成功！");
            }
            catch (Exception ex)
            {
                Console.WriteLine("邮件发送失败：" + ex.Message);
            }
        }
    }
}