r.a.d.chart can be automatically bound to an external data source, e.g. a database.

The left chart is bound to the ASP.NET 2.0 Access DataSource Control.
The initial Select command of the DataSource Control returns the all data for one category without grouping by subcategory.
The DataSourceMode is set to DataReader.

The right chart uses an old ASP.NET-style data binding to a DataSet object.
Ititially this chart is bound to a DataTable object and displays data in Pie.

The dropdowns at the top are used to filter the database data used fro a databinding.
After filtering both charts will display same data grouped by subcategory.