2 grids in Crystal report

Hi,

I need to create a report with more than one grid and chart. How can I do that and how can I set more than one datatable for the report? I neet to set datatable from code behind.

CrystalReport1 cr1 = new CrystalReport1();
cr1.SetDataSource(dt);
CrystalReportViewer1.ReportSource = cr1;
CrystalReportViewer1.RefreshReport();