public retrieveMultipleRecords(entityLogicalName: string, options?: string, maxPageSize?: number): Xrm.Async.PromiseLike<Xrm.RetrieveMultipleResult> {
    if (this.isOffline) {
      return this.offline.retrieveMultipleRecords(entityLogicalName, options, maxPageSize);
    } else {
      return this.online.retrieveMultipleRecords(entityLogicalName, options, maxPageSize);