public string AddReccurrence(TaskTracker _obj)
 {
     TaskTracker _objTask = new TaskTracker();
     try
     {
         _objTask.AddReccurrence(_obj.Task_ID, _obj.InternalRadioOption, _obj.DayInterval, _obj.MonthInterval, _obj.WeekNumber, _obj.WeekDayName, _obj.MonthName ,_obj.AppointmentStartTime, _obj.AppointmentEndTime, _obj.RecurrencePatternType, _obj.RecurrencePatternInterval, _obj.RecurrencePatternFallOn,  _obj.RecurrenceRangeStartDate, _obj.RecurrenceRangeEndByDate, _obj.RecurrenceRangeType, _obj.RecurrenceRangeOccurrence);
     }
     catch (Exception ex) { return "error"; }
     return "ok";
 }