private void WorkerThreadFunc()
        {
            if (settings != null && true)
            {
                dbHelper helper = new dbHelper();

                string smtpEmailAddress = settings["SMTPUserName"];
                string smtpPassword = settings["SMTPPassword"];
                // string fromEmail = settings["FromEmail"];
                // string fromDisplayName = settings["FromDisplayName"];
                string smtpClientHost = settings["SMTPHostName"];
                int smtoClientPort = int.Parse(settings["SMTPHostPort"]);
                bool enableSsl = bool.Parse(settings["EnableSSL"]);
                bool useDefaultCredentials = bool.Parse(settings["UseDefaultCredentials"]);
                int emailForBulk = 50, reTryTime = 5;
                int.TryParse(settings["EmailForBulk"], out emailForBulk);
                int.TryParse(settings["ReTryTime"], out reTryTime);
                var databundle = helper.GetmailBulk(DateTime.Now, emailForBulk);

                var notsendbundle = helper.GetFailedBulk(reTryTime);
                if (databundle != null)
                {
                    databundle.AddRange(notsendbundle);
                }
                else
                    databundle = notsendbundle;
                if (databundle != null)
                {
                    helper.SetSettingFromKey("LastRunTime", DateTime.Now.ToString());
                    Parallel.ForEach(databundle, item =>
                    {
                        string newGuid = Guid.NewGuid().ToString();
                        var mail = new mailDetails() { guid = newGuid, mail = item };
                        collection.Add(mail);

                        sendEmail(mail, smtpEmailAddress, smtpPassword, smtpClientHost, smtoClientPort, enableSsl, useDefaultCredentials);
                    });
                }
            }

            current_thread_count--;
            if (!emailerTimer.Enabled)
                emailerTimer.Start();
        }