Active Query Builder let create as many QueryBuilder objects as you need. It lets use them on different pages or put several query builder on one page. To create another instance of the component each time the user needs new query builder, pass the unique string to the QueryBuilderStore.Create() method as follows:
var qb = QueryBuilderStore.Create(Guid.NewGuid().ToString());
In the previous major version 2.x it was necessary to set the MultipleQueriesPerSession directive in the "appSettings" section of 'web.config' file instructs to start building a new query each time web browser opens the page.
<add key="MultipleQueriesPerSession" value="true" />
This method is no longer valid in the version 3.x.