Hi Jeffery,
We regret very much for the delayed response. It is possible to load the First Chart from a database using ChartDataBindModel and Pass on the selected index to load the corresponding data in to Second Chart. I have attached a simple sample that illustrates the same in this link below.
http://websamples.syncfusion.com/samples/Chart.Web/6.4.0.2/F77007/Sample.htmKindly let us know if this meets your requirements. Thanks for your patience.
Regards,
Manohari.R