C# 發送電子郵件

網上找到的發送郵件的類，改了一點點，在此謝謝原做者的奉獻。

１.源碼：   
 public class CSendMail
    {
        private MailMessage mailMessage;
        private SmtpClient smtpClient;
        private string password;//發件人密碼 

        //郵件發送後提醒
        public String Info
        {
            get;
            set;
        }
        /// <summary>  
        /// 處審覈後類的實例  
        /// </summary>  
        /// <param name="To">收件人地址</param>  
        /// <param name="From">發件人地址</param>  
        /// <param name="Body">郵件正文</param>  
        /// <param name="Title">郵件的主題</param>  
        /// <param name="Password">發件人密碼</param>  
        public CSendMail(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);//實例化附件  
                disposition = data.ContentDisposition;
                disposition.CreationDate = System.IO.File.GetCreationTime(path[i]);//獲取 附件的建立日期  
                disposition.ModificationDate = System.IO.File.GetLastWriteTime(path[i]);//獲取附件的修改日期  
                disposition.ReadDate = System.IO.File.GetLastAccessTime(path[i]);//獲取附 件的讀取日期  
                mailMessage.Attachments.Add(data);//添加到附件中  
            }
        }
        /// <summary>  
        /// 異步發送郵件  
        /// </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);//設置發件人身份的票據  
                smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                smtpClient.Host = "smtp." + mailMessage.From.Host;
                smtpClient.SendCompleted += new SendCompletedEventHandler
                (CompletedMethod);//註冊異步發送郵件完成時的事件  
                smtpClient.SendAsync(mailMessage, mailMessage.Body);
            }
        }
        /// <summary>  
        /// 發送郵件  
        /// </summary>  
        public void Send()
        {
            if (mailMessage != null)
            {
                try
                {
                    smtpClient = new SmtpClient();
                    smtpClient.Credentials = new System.Net.NetworkCredential
                    (mailMessage.From.Address, password);//設置發件人身份的票據  
                    smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                    smtpClient.Host = "smtp." + mailMessage.From.Host;
                    smtpClient.Timeout = 3000;　／／設置超時時間
                    smtpClient.Send(mailMessage);
                }
                catch (SmtpException ex)
                {
                      Info = "郵件發送失敗"; 
                }
            }
        }

        private static void CompletedMethod(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
        {
            // Get the unique identifier for this asynchronous operation.
            String token = (string)e.UserState;
            if (e.Error != null)
            {
                // 異步發送的錯誤信息
                // Console.WriteLine("[{0}] {1}", token, e.Error.ToString());
            }
        }
    }

　２.使用，經測試ＱＱ／１６３／ｓｉｎａ都可使用
　　
　　 TYKY_OA.Web.CSendMail sm = new CSendMail(this.qqNum.Value.Trim() + "@qq.com",
    "ＸＸＸ@163.com", "已重置你的的密碼，新密碼爲：" + password + "  請注意保管！",
    "密碼重置郵件", "××××××");
     sm.Send();
     //發送失敗
     if (sm.Info != null)
     {
         ClientScript.RegisterStartupScript(this.GetType(), "tooltip", "alert('郵件發送失敗，可能的緣由是網絡故障或郵箱不可達...')",true);
     }
     //發送成功
     else
     {
        //修改數據庫密碼字段
        staff.pwd = password;
        if (bllstaffs.Update(staff))
        {
             ClientScript.RegisterStartupScript(this.GetType(), "tooltip", "alert('密碼已重置，請注意查收郵件')", true);
        }
       else
        {
             ClientScript.RegisterStartupScript(this.GetType(), "tooltip", "alert('密碼重置失敗)", true);
        }

}