下面黄色代码为实现发送邮件

FileStream fs = new FileStream(Server.MapPath("../ImportUserIOExcel/productConsultAnwser.html"), FileMode.OpenOrCreate, FileAccess.Read);
                                StreamReader sr = new StreamReader(fs, Encoding.UTF8);
                                string strTemp = sr.ReadToEnd();
                                sr.Close();
                                fs.Close();
                                //if (queryTemp.spec_name1 == "" && queryTemp.spec_name2 == "")
                                //{
                                //    product_name = queryTemp.brand_name + queryTemp.product_name;
                                //}
                                //else
                                //{
                                //    product_name = queryTemp.brand_name + queryTemp.product_name + "(" + queryTemp.spec_name1 + "  " + queryTemp.spec_name2 + ")";
                                //}
                                product_name = queryTemp.product_name;
                                strTemp = strTemp.Replace("{{$username$}}", userName);
                                strTemp = strTemp.Replace("{{$productName$}}", product_name);
                                strTemp = strTemp.Replace("{{$consultInfo$}}", consultInfo);
                                strTemp = strTemp.Replace("{{$consultAnwser$}}", answerInfo);
                                strTemp = strTemp.Replace("{{$productUrl$}}", productUrl);
                                sendmail(EmailFrom, FromName, userEmail, userName, EmailTile, strTemp, "", SmtpHost, Convert.ToInt32(SmtpPort), EmailUserName, EmailPassWord);

public bool sendmail(string sfrom, string sfromer, string sto, string stoer, string sSubject, string sBody, string sfile, string sSMTPHost, int sSMTPPort, string sSMTPuser, string sSMTPpass)
        {
            ////设置from和to地址
            MailAddress from = new MailAddress(sfrom, sfromer);
            MailAddress to = new MailAddress(sto, stoer);

////创建一个MailMessage对象
            MailMessage oMail = new MailMessage(from, to);
            //// 添加附件
            if (sfile != "")
            {
                oMail.Attachments.Add(new Attachment(sfile));
            }
            ////邮件标题
            oMail.Subject = sSubject;
            ////邮件内容
            //oMail.Body = sBody;
            AlternateView htmlBody = AlternateView.CreateAlternateViewFromString(sBody, null, "text/html");
            oMail.AlternateViews.Add(htmlBody);
            ////邮件格式
            oMail.IsBodyHtml = true;
            ////邮件采用的编码
            oMail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");
            ////设置邮件的优先级为高
            oMail.Priority = MailPriority.Normal;
            ////发送邮件
            SmtpClient client = new SmtpClient();
            ////client.UseDefaultCredentials = false;
            client.Host = sSMTPHost;
            client.Port = sSMTPPort;
            client.Credentials = new NetworkCredential(sSMTPuser, sSMTPpass);
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            try
            {
                client.Send(oMail);
                return true;
            }
            catch (Exception ex)
            {
             
            }
            finally
            {
                ////释放资源
                oMail.Dispose();
            }

}