/// <summary>
        /// 发送邮件方法
        /// </summary>
        /// <param name="to">电子邮件地址</param>
        /// <param name="subject">邮件主题</param>
        /// <param name="filePath">文件路径</param>
        /// <param name="fileName">文件名</param>
        public static void SendMail(MailAddressCollection sendTo, string subject,string filePath,string fileName)
        {
            System.Net.Mail.MailMessage mailmsg = new System.Net.Mail.MailMessage();
            if (sendTo != null)
            {
                //得到邮件地址
                foreach (MailAddress address in sendTo)
                    mailmsg.To.Add(address);
            }
            MailAddress FromAddress = new MailAddress(accountName);
            mailmsg.From = FromAddress;
            mailmsg.Subject = subject;
            mailmsg.IsBodyHtml = true;//设置邮件内容的格式
            mailmsg.BodyEncoding = System.Text.Encoding.UTF8;//邮件内容编码 
            //得到html文件
            string htmlFileContent=GetHtmlFile(filePath, fileName);
            //对html中的src进行cid化
            string strHtml = GetSendHtml(fileName,htmlFileContent);
            //得到图片路径集合
            ArrayList imgSrcPath = GetImgSrcPath(htmlFileContent,filePath,fileName);
            //设置潜入资源的ContentID的集合
            ArrayList contentId = SetContentId(imgSrcPath);
            //得到图片名称集合
            ArrayList ImgNameColletion = GetImgNameCollection(htmlFileContent, filePath);
            //得到发送html文件
            string sendHtml = SetSendHtml(strHtml, contentId, ImgNameColletion);
            //设置邮件的查看格式
            AlternateView mailContent = AlternateView.CreateAlternateViewFromString(sendHtml, null, MediaTypeNames.Text.Html);
            mailmsg.AlternateViews.Add(mailContent);
            if (imgSrcPath.Count > 0)
            {
                for (int i = 0; i < imgSrcPath.Count; i++)
                {
                    //设置邮件的潜入资源图片
                    LinkedResource linkResource = new LinkedResource(imgSrcPath[i].ToString());
                    linkResource.ContentId = contentId[i].ToString();
                    mailContent.LinkedResources.Add(linkResource);
                }
            }
             

            System.Net.Mail.SmtpClient client = new SmtpClient();
            client.Host = smtpServer;
            client.Port = smtpPort;
            client.Credentials = new System.Net.NetworkCredential(accountName, password);//用户名和密码
            client.EnableSsl = true;
            client.Send(mailmsg);
        }

 public bool Send(String fromAddress, String toAddress, String subject, String body)
        {
            string strHost = string.Empty;
            string strAccount = string.Empty;
            string strPwd = string.Empty;
            string strFrom = string.Empty;

            strHost = ConfigurationManager.AppSettings["Host"].ToString(); //STMP服务器地址
            strAccount = ConfigurationManager.AppSettings["UserName"].ToString(); //SMTP服务帐号
            strPwd = ConfigurationManager.AppSettings["Pwd"].ToString(); //SMTP服务密码
            strFrom = ConfigurationManager.AppSettings["From"].ToString(); //发送方邮件地址

            SmtpClient _smtpClient = new SmtpClient();
            _smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network; //指定电子邮件发送方式
            _smtpClient.Host = strHost; //指定SMTP服务器
            _smtpClient.Credentials = new System.Net.NetworkCredential(strAccount, strPwd); //用户名和密码

            MailMessage _mailMessage = new MailMessage(strFrom, toAddress);
            _mailMessage.Subject = subject; //主题
            _mailMessage.Body = body; //内容
            _mailMessage.BodyEncoding = System.Text.Encoding.UTF8; //正文编码
            _mailMessage.IsBodyHtml = false; //设置为HTML格式
            _mailMessage.Priority = MailPriority.High; //优先级

            try
            {
                _smtpClient.Send(_mailMessage);
                return true;
            }
            catch
            {
                return false;
            }
        }

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Web.Mail;

/// <summary>
/// EmailSystem 的摘要说明
/// </summary>
public class EmailSystem
{
    private string emailuser;
    private string emailpsw;
    private string emailport;
    private string emailsubject;
    private string emailname;//show the web title
    private string emailinfo;
    private string emailsmtp;
    public EmailSystem()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }
    public void GetEmailInfo()
    {
        DataSystem mydata = new DataSystem();
        mydata.ConnectionString = ConfigurationManager.ConnectionStrings["DBString"].ToString();
        mydata.Open();
        SqlDataReader reader = mydata.StoredProcGetDataReader("WebInfo");
        if (reader.HasRows)
        {
            while (reader.Read())
            {
                this.emailuser = reader["system_email_user"].ToString();
                this.emailinfo = reader["system_email_info"].ToString();
                this.emailname = reader["title"].ToString();
                this.emailport = reader["system_email_port"].ToString();
                this.emailpsw = reader["system_email_psw"].ToString();
                this.emailsubject = reader["system_email_title"].ToString();
                this.emailsmtp = reader["system_email_smtp"].ToString();
            }
        }
        reader.Close();
        mydata.Close();
        
    }
    public void SendEmail(string mailaddress,string subject,string mailinfo)
    {//.net smtp类进行邮件发送，支持认证，附件添加；
        MailMessage mailmsg = new MailMessage();
        mailmsg.From = emailname;
        mailmsg.To = mailaddress;
        mailmsg.Subject = subject;
        mailmsg.Body = mailinfo;

        mailmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
        //是否需要验证，一般是要的
        mailmsg.Fields.Add
        ("http://schemas.microsoft.com/cdo/configuration/sendusername",emailuser);
        //自己邮箱的用户名
        mailmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", emailpsw);
        mailmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserverport", emailport);
        mailmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl", "true");
        //自己邮箱的密码
        SmtpMail.SmtpServer = emailsmtp;
        SmtpMail.Send(mailmsg);
    }
    public void SendRegEmail(string mailaddress)
    {
        this.SendEmail(mailaddress, this.emailsubject, this.emailinfo);
    }
}