private void ResetCrawler()
        {
            //clear the Discoveries...
            _crawler.ClearDiscoveries();

            //clear the Politeness...
            _crawler.ClearPolitenesses();

            //clear the uncrawled CrawlRequests...
            _crawler.ClearUncrawledCrawlRequests();

            //clear the DisallowedAbsoluteUris table...
            _crawler.ClearDisallowedAbsoluteUris();
        }