Hi Geoffrey,
Thank you very much for your interest in Syncfusion Products.
Using XlsIO, chart worksheets and embedded charts of different types can be developed similar to MS Excel charts. The interface IChartFrameFormat is used to change the format of the chart.
To know more about the XlsIO charts, please navigate to the below link and let us know if this helps you.
Article Link:
http://www.syncfusion.com:91/products/xlsio/backoffice/Articles/charts.aspxPlease let us know if you need any further assistance.
Regards,
Pauline Bosco