c# 发送邮件

using System.Net;
using System.Net.Mail;
public void SendMail()
{
    string m_strSMTPserver = string.Empty;
    string m_strSMTPuser = string.Empty;
    string m_strSMTPpwd = string.Empty;
    string m_strSMTPsendto = string.Empty;
    string m_strSMTPFrom = string.Empty;
    lock (ma_ptr.m_cs)
    {
        m_strSMTPserver = ma_ptr.m_strSMTPserver;
        m_strSMTPuser = ma_ptr.m_strSMTPuser;
        m_strSMTPpwd = ma_ptr.m_strSMTPpwd;
        m_strSMTPsendto = ma_ptr.m_strSMTPsendto;
        m_strSMTPFrom = ma_ptr.m_strSMTPfrom;
    }
    //设置发件人
    MailAddress from = new MailAddress(m_strSMTPFrom, @"网站状态查询");
    //设置邮件
    MailMessage mail = new MailMessage();
    //设置标题
    mail.SubjectEncoding = Encoding.UTF8;
    mail.Subject = string.Format("网站异常状态通知");
    //设置邮件内容
    mail.BodyEncoding = Encoding.UTF8;
    mail.IsBodyHtml = true;//设置为html格式
    string t = @"<p>网站异常状态报告</p><table border=0><tr><th>网站</th><th>状态</th></tr>";
    lock (ma_ptr.m_cs)
    {
        foreach (int i in ma_ptr.m_errList)
        {
            t = string.Format(@"{0}<tr><td>{1}</td><td>{2}</td></tr>", t, ma_ptr.c_data.Rows[i].Cells[0].Value.ToString(), ma_ptr.c_data.Rows[i].Cells[1].Value.ToString());
        }
    }
    t = string.Format(@"{0}</table><p>made by http://www.xiaocan.me</p>", t);
    mail.Body = t;
    //设置收件人
    mail.To.Add(new MailAddress(m_strSMTPsendto, m_strSMTPsendto));
    //设置发件人
    mail.From = from;
    //设置邮件发送级别
    mail.Priority = MailPriority.Normal;
    //             设置邮件的附件，将在客户端选择的附件先上传到服务器保存一个，然后加入到mail中
    //             string fileName = txtUpFile.PostedFile.FileName.Trim();
    //             fileName = "D:/UpFile/" + fileName.Substring(fileName.LastIndexOf("/") + 1);
    //             txtUpFile.PostedFile.SaveAs(fileName); // 将文件保存至服务器
    //             mail.Attachments.Add(new Attachment(fileName));
    mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;
    //发送
    SmtpClient client = new SmtpClient();
    //设置主机名称
    client.Host = m_strSMTPserver;
    //设置非默认登陆
    client.UseDefaultCredentials = false;
    //设置验证
    client.Credentials = new NetworkCredential(m_strSMTPuser, m_strSMTPpwd);
    //处理待发送电子邮件方式
    client.DeliveryMethod = SmtpDeliveryMethod.Network;
    //送出
    try
    {
        client.Send(mail);
    }
    catch (Exception ex)
    {
    }
}