C#发送Email

/// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="send">发信人地址</param>
        /// <param name="receive">收信人地址</param>
        /// <param name="subject">邮件标题</param>
        /// <param name="body">邮件正文</param>
        /// <param name="userName">用户名</param>
        /// <param name="password">密码</param>
        /// <param name="smtpHost">smtp地址</param>
        /// <param name="IsHtml">是否是HTML格式的邮件</param>
        public void SendMail(string send, string receive, string subject, string body, string userName, string password, string smtpHost, bool IsHtml)
        {
            //string send = "phcis@163.com";//发送邮件的mail地址
            //string receive = "phcis@163.com";//接收邮件的mail地址
            //string subject = "邮件主题";//邮件主题
            //string userName = "userName";//发送邮件使用的用户名
            //string password = "userPwd";//发送邮件使用的密码
            //string smtpHost = "smtp.xxx.com";//smtp地址，如smtp.163.com
            SmtpClient smtp = new SmtpClient(smtpHost);
            smtp.Credentials = new System.Net.NetworkCredential(userName, password);
            MailMessage mes = new MailMessage();

            mes.From = new MailAddress(send);
            mes.To.Add(receive);

            mes.Subject = subject;
            mes.Body = body;
            mes.IsBodyHtml = IsHtml;//使用是否html格式
    
            //增加附件
            //System.Net.Mail.Attachment mailAttach = new  Attachment(@"d:\b.txt");
            //mes.Attachments.Add(mailAttach);
            
            smtp.Send(mes);
            //mailAttach.Dispose();//释放由附件占用的资源
        }