c# System.Net.Mail 寄送信件、夾帶附件

public static bool SendMail(bool FlagAddAttachment)
{
            
  //server address
  string MailServer = "mail server address";
  //port
  int Port = 25;
  //account
  string MailAccount  = "login account";
  //pwd
  string MailPassWord = "login password";
  //senderFrom
  System.Net.Mail.MailAddress SendFrom = new System.Net.Mail.MailAddress("mail address");
  //senderTo
  string SendTo  = "mail address";
  //cc
  string SendCC  = "mail address";
  //title
  string Subject = "mail title";
  //body
  string Body    = "mail body";
                
  try
  {
    //crate SmtpClient object && set SMTP/Port 
    System.Net.Mail.SmtpClient MySmtp = new System.Net.Mail.SmtpClient(MailServer, Port);
    //set account/pwd
    MySmtp.Credentials = new System.Net.NetworkCredential(MailAccount, MailPassWord);
    //smtp using SSL
    MySmtp.EnableSsl = true;
    //set mail's Msg
    System.Net.Mail.MailMessage MyMail = new System.Net.Mail.MailMessage();
    //Set senderfrom
    MyMail.From = SendFrom;
    //Add senderto
    MyMail.To.Add(SendTo);
    //Add cc
    MyMail.CC.Add(SendCC);
    //Add title
    MyMail.Subject = Subject;
    //Add body
    MyMail.Body = Body;
    //Add Attachment
    if (FlagAddAttachment == true)
    {
      string strFilePath = @"c:\test.txt";//your file path
      System.Net.Mail.Attachment attachment1 = new System.Net.Mail.Attachment(strFilePath);//add object 
      attachment1.Name = System.IO.Path.GetFileName(strFilePath);
      attachment1.NameEncoding = System.Text.Encoding.GetEncoding("gb2312");
      attachment1.TransferEncoding = System.Net.Mime.TransferEncoding.Base64;
      attachment1.ContentDisposition.Inline = true;
      attachment1.ContentDisposition.DispositionType
      =System.Net.Mime.DispositionTypeNames.Inline;
      MyMail.Attachments.Add(attachment1);
    }
    //Send  mail
    MySmtp.Send(MyMail);
    return true;
  }
  catch (Exception e)
  {
      _ErrorMessage = e.Message;
      return false;
  }
}