C#发送邮件代码

using System;  
using System.Net;  
using System.Net.Mail;  
using System.Net.Mime;  
namespace Fish 
{  
    /// <summary>  
    /// 发送邮件的类  
    /// </summary>  
    public class SendMail  
    {  
        private MailMessage mailMessage;  
        private SmtpClient smtpClient;  
        private string password;//发件人密码  
        /// <summary>  
        /// 处审核后类的实例  
        /// </summary>  
        /// <param name="To">收件人地址</param>  
        /// <param name="From">发件人地址</param>  
        /// <param name="Body">邮件正文</param>  
        /// <param name="Title">邮件的主题</param>  
        /// <param name="Password">发件人密码</param>  
        public SendMail(string To, string From, string Body, string Title, string 
Password)  
        {  
            mailMessage = new MailMessage();  
            mailMessage.To.Add(To);  
            mailMessage.From = new System.Net.Mail.MailAddress(From);  
            mailMessage.Subject = Title;  
            mailMessage.Body = Body;  
            mailMessage.IsBodyHtml = true;  
            mailMessage.BodyEncoding = System.Text.Encoding.UTF8;  
            mailMessage.Priority = System.Net.Mail.MailPriority.Normal;  
            this.password = Password;  
        }  
        /// <summary>  
        /// 添加附件  
        /// </summary>  
        public void Attachments(string Path)  
        {  
            string[] path = Path.Split(',');  
            Attachment data;  
            ContentDisposition disposition;  
            for (int i = 0; i < path.Length; i++)  
            {  
                data = new Attachment(path[i], MediaTypeNames.Application.Octet);//实例化 
附件  
                disposition = data.ContentDisposition;  
                disposition.CreationDate = System.IO.File.GetCreationTime(path[i]);//获取 
附件的创建日期  
                disposition.ModificationDate = System.IO.File.GetLastWriteTime(path[i]);// 
获取附件的修改日期  
                disposition.ReadDate = System.IO.File.GetLastAccessTime(path[i]);//获取附 
件的读取日期  
                mailMessage.Attachments.Add(data);//添加到附件中  
            }  
        }  
        /// <summary>  
        /// 异步发送邮件  
        /// </summary>  
        /// <param name="CompletedMethod"></param>  
        public void SendAsync(SendCompletedEventHandler CompletedMethod)  
        {  
            if (mailMessage != null)  
            {  
                smtpClient = new SmtpClient();  
                smtpClient.Credentials = new System.Net.NetworkCredential 
(mailMessage.From.Address, password);//设置发件人身份的票据  
                smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;  
                smtpClient.Host = "smtp." + mailMessage.From.Host;  
                smtpClient.SendCompleted += new SendCompletedEventHandler 
(CompletedMethod);//注册异步发送邮件完成时的事件  
                smtpClient.SendAsync(mailMessage, mailMessage.Body);  
            }  
        }  
        /// <summary>  
        /// 发送邮件  
        /// </summary>  
        public void Send()  
        {  
            if (mailMessage != null)  
            {  
                smtpClient = new SmtpClient();  
                smtpClient.Credentials = new System.Net.NetworkCredential 
(mailMessage.From.Address, password);//设置发件人身份的票据  
                smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;  
                smtpClient.Host = "smtp." + mailMessage.From.Host;  
                smtpClient.Send(mailMessage);  
            }  
        }  
    }  
}  

引自：http://www.cnblogs.com/mgod/archive/2008/07/17/1244814.html