private void DeleteOldData()
        {
            SqlDataReader dataReader = null;

            try
            {
                List <string> deleteKeys = new List <string>();

                // ja - get all of the jobs that are printed and that are at least x minutes old
                dataReader = SqlCmd.GetOldJobsReader();

                // ja - loop through old jobs and add to our list
                while (dataReader.Read())
                {
                    string sKey = dataReader["Label_Key"].ToString();
                    deleteKeys.Add(sKey);
                }

                dataReader.Close();

                // ja - there are jobs to delete
                if (deleteKeys.Count > 0)
                {
                    Console.WriteLine("Deleting Old Data...");

                    // ja - loop through list and delete from the serial table first and then the job table
                    foreach (string sKey in deleteKeys)
                    {
                        // ja - delete the rows (not going to worry about the results)
                        SqlCmd.DeleteSerials(sKey);
                        SqlCmd.DeleteJobs(sKey);
                    }
                }
            }
            catch (System.Exception ex)
            {
                dataReader.Close();
                Config.Log(ex.Message);
            }
        }