private GetOfflineTransactionCountDataResponse GetOfflineTransactionCount(SqliteDatabaseContext databaseContext)
            {
                string queryString = string.Format("SELECT COUNT(TRANSACTIONID) FROM {0};", MainRetailTransactionTableName);
                int    offlineTransactionsCount = (int)databaseContext.ExecuteScalar <int>(new SqlQuery(queryString));

                return(new GetOfflineTransactionCountDataResponse(offlineTransactionsCount));
            }