public class SendEmail
  {
  /// <summary>
  /// 发送电子邮件
  /// </summary>
  /// <param name="strTo">收件人地址</param>
  /// <param name="title">邮件标题</param>
  /// <param name="mailContent">邮件内容</param>
  /// <param name="Attachments">附件，如果没有附件则为NULL</param>
  /// <returns>发送邮件是否成功</returns>
  public static bool SendEMail(string strTo, string title, string mailContent, List<string> Attachments)
  {

  MailMessage mail = new MailMessage();

  //设置邮件的标题
  mail.Subject = title;

  //设置邮件的发件人
  // mail.From = new MailAddress("Service@YKG.COM", "易酷购", System.Text.Encoding.UTF8);

  //设置邮件的收件人
  mail.To.Add(strTo); //收件人

  //设置邮件的内容
  mail.Body = mailContent;
  //设置邮件的格式
  mail.BodyEncoding = System.Text.Encoding.UTF8;
  mail.IsBodyHtml = true;
  //设置邮件的发送级别
  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 = "";
  //txtUpFile.PostedFile.SaveAs(fileName); // 将文件保存至服务器
  if (Attachments != null)
  {
  foreach (string fileName in Attachments)
  {
  mail.Attachments.Add(new Attachment(fileName));
  }
  }
  mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;

  SmtpClient client = new SmtpClient();
  client.DeliveryMethod = SmtpDeliveryMethod.Network;

  try
  {
  client.Send(mail);
  return true;
  }
  catch (Exception ex)
  {
  return false;
  }   
  }
  }