Yes, it is possible to have multiple series in a single Chart control. You can check out this
online demo, where BarSeries and SplineSeries are used together. Basically you need to include a SeriesMapping with appropriate SeriesDefinition for each series you need to have.
However I would suggest that you consider using our new chart control RadChartView (online demos here
, comparison between the two controls here
). The ChartView offers a much better performance and it is also possible to define several series in a single ChartView control.
the Telerik team