public string InsertOrUpdateTimesheets(List <Timesheet> timesheetList)
        {
            StringBuilder sb = new StringBuilder();

            if (timesheetList != null && timesheetList.Count > 0)
            {
                try
                {
                    for (int i = 0; i < timesheetList.Count; i++)
                    {
                        _repository.InsertOrUpdate(timesheetList[i]);
                    }
                }
                catch (Exception ex)
                {
                    sb.Append(ex.Message);
                }
            }
            return(sb.ToString());
        }