邮件服务发送丢失的邮件

我做了邮件服务。当我调试从数据库接收到的数据时,它会将其全部发送出去,但当我运行服务时,它会发送一些数据。这是什么原因?

数据库中有10条记录。它完全随调试一起发送。当我运行 Windows服务 使用F5调试 , 某些部分 我希望我能告诉你我的问题。

我认为问题是我的邮件中没有“标题”。你的想法是什么?

同时,我为我的英语不好道歉。 Please open the image

  public bool SendMail(string Body, string Subject, List<string> ToList)
    {
        MailMessage mail = new MailMessage();
        mail.From = From;
        bool ReturnValue = false;
        if (ToList.Count < 0)
        {
            return ReturnValue;
        }

        foreach (string Mailaddress in ToList)
        {
            mail.To.Add(Mailaddress);
        }
        mail.Subject = Subject; 
        mail.Body =  Body ;
        try
        {
            ServicePointManager.ServerCertificateValidationCallback =
            delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
            { return true; };
            Client.Send(mail);
            ReturnValue = true;
        }
        catch (Exception ex)
        {
            ILog log = LogManager.GetLogger(typeof(MailHelper));
            log.Error(ex.Message, ex);
        }

        return ReturnValue;
    }

 protected MailHelper()
    {
        Client = new SmtpClient(ConfigurationManager.AppSettings["SmtpClient"].ToString());
        From = new MailAddress(ConfigurationManager.AppSettings["MailAddressFrom"].ToString(), ConfigurationManager.AppSettings["MailAddressFromDisplayName"].ToString());
        //ToList = new List<string>{"trying@trying.com.tr"};   
        Client.Port = Convert.ToInt32(ConfigurationManager.AppSettings["PortNumber"]);
        Client.Credentials = new System.Net.NetworkCredential(ConfigurationManager.AppSettings["UserName"], ConfigurationManager.AppSettings["Password"]);
        Client.EnableSsl = true;
    }


<add key="log4net.Config" value="App.config" />
<add key="log4net.Config.Watch" value="True" />
<add key="ClientSettingsProvider.ServiceUri" value="" />
<add key="TimerInterval" value="3000" />
<add key="constr" value="Data Source=.;Initial Catalog=MailSending;Integrated Security=False;Persist Security Info=True;Integrated Security=SSPI"/>

 DateTime davaTarih = Convert.ToDateTime(row["ModuleDate"]);
                            DateTime sonrakiDurusmaTarihi = Convert.ToDateTime(row["FollowingTrialDate"]);
                            string avukatName = row["Username"].ToString();
                            string esasNo = row["No"].ToString();
                            int countDays = Convert.ToInt32(row["countDays"]);
                            string kisaAciklama = row["ShortDescription"].ToString();
                            string sonrakidurusmaTar = "";

                            if (!DBNull.Value.Equals(row["FollowingTrialDate"]) && !DBNull.Value.Equals(row["countDays"]))
                            {
                                sonrakiDurusmaTarihi = Convert.ToDateTime(row["FollowingTrialDate"]);
                            }
                            else
                            {
                                sonrakiDurusmaTarihi = Convert.ToDateTime("");
                                sonrakidurusmaTar = "Sonraki Duruşma Bulunmamaktadır.";
                                // var sonrakiDurusma = DateTime.TryParse(SonrakidurusmaTar, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal, out sonrakiDurusmaTarihi);  // FollowingTrialDate, null olarak gelirse hata vermesin amacıyla yazıldı.
                            }

                            ModuleSubject = " Mnemonic Hatırlatma Servisi";
                            ModuleBody = "Sayın ilgili, ;\r\n \r\n" +
                                    "Modül: " + ModuleName + ";\r\n" +
                                    "Esas no: " + esasNo + ";\r\n" +
                                    "Dava tarihi: " + davaTarih.ToShortDateString() + ";\r\n" +
                                    "Sonraki duruşma tarihi: " + sonrakiDurusmaTarihi.ToShortDateString() + ";\r\n" +
                                    "Kalan Gün Sayısı: " + countDays + ";\r\n" +
                                    "Kısa açıklama: " + kisaAciklama + ";\r\n\r\n" +
                                    "Bilginize,";

                     MailHelper.Instance.SendMail(ModuleBody, ModuleSubject, ToList);