ASP.NET Chart Design-time Support
The design time features are accessed through the Smart Tag of the control.
Here you can either choose an already existing declarative datasource control from the list, or add a new one:
Then you can configure the datasource, regardless whether it was just added or already exists.
Also you can configure the control via the design time property window which will generate an appropriate editors for all chart properties and will show at design time all chart’s events.