How to manage threads for creating scheduler?

public static void LoadScheduler()
{
      try
      {
         schedulerFullInfoBO = objAdvisorServiceClient.SchedulerInformationService(DAL.advisorID, DateTime.Now, DateTime.Now.AddDays(1), "Reminder", "");//this will get list of reminder for today
                
         if (tReminder != null) //tReminder is thread which will create threads for opening forms 
         {
             tReminder.Abort();
             tReminder = null;
         }
         SyncSchedule();//this function is calculating when to show form
      }
      catch (Exception ex)
      {
          MessageBox.Show(ex.Message);
      }
}

public static void SyncSchedule()
{
   if (schedulerFullInfoBO != null && schedulerFullInfoBO.Length > 0)
   {
      schedulerFullInfoBO = schedulerFullInfoBO.OrderBy(us => us.schedulerBO.Reminder_On).ToArray();
      if ((schedulerFullInfoBO[0].schedulerBO.Reminder_On - DateTime.Now).Ticks > 0)
      {
         if (tReminder == null)
         { 
          tReminder = new System.Threading.Thread(new System.Threading.ParameterizedThreadStart(ShowReminder));
          tReminder.IsBackground = true;
          tReminder.Start();
         }
       }
       else //this is for the condition if he has created reminder for specific time but app was close so on startup this will be show
       {
         frmReminder objReminder = new frmReminder(schedulerFullInfoBO[0]);
         objReminder.Show();
         schedulerFullInfoBO = schedulerFullInfoBO.Skip(1).ToArray();                    
         SyncSchedule();                
       }
    }
}
static void ShowReminder(object reminderFullInfoBO)
{
    while (schedulerFullInfoBO != null && schedulerFullInfoBO.Length > 0)
    {
        ts = new TimeSpan((schedulerFullInfoBO[0].schedulerBO.Reminder_On - DateTime.Now).Ticks >= 0 ? (schedulerFullInfoBO[0].schedulerBO.Reminder_On - DateTime.Now).Ticks : 0);
//now this will put thread sleep for specific timespan
        System.Threading.Thread.Sleep(ts);
//tReminder thread is maintaining other threads
        System.Threading.Thread threadOpenReminder = new System.Threading.Thread(new System.Threading.ParameterizedThreadStart(openReminder));
        threadOpenReminder.IsBackground = true;
        threadOpenReminder.Start(schedulerFullInfoBO[0]);
        schedulerFullInfoBO = schedulerFullInfoBO.Skip(1).ToArray();
    }
}
//below function will open reminder form
static void openReminder(object reminderFullInfoBO)
{
    SchedulerFullInfoBO objBO = reminderFullInfoBO as SchedulerFullInfoBO;
    frmReminder objReminder = new frmReminder(objBO);
    objReminder.ShowDialog();
}

void snooze()
{
      TimeSpan ts = new TimeSpan((dtpReminder.Value - DateTime.Now).Ticks);
      System.Threading.Thread.Sleep(ts);
}