How to set datasource of Sub crystal report in c# win form app

Question

I am using this code to load a main report and a subreport inside the main report. The main report is a blank one and just contains subreport.

Here is my code:

Answer 1

ReportDocument cryRpt = new ReportDocument();
cryRpt.Load("C:/MainReport.rpt");
cryRpt.DataSourceConnections.Clear();
cryRpt.SetDataSource(ds.Tables[0]);
cryRpt.Subreports[0].DataSourceConnections.Clear();
cryRpt.Subreports[0].SetDataSource(ds.Tables[0]);
crystalReportViewer1.ReportSource = cryRpt;
crystalReportViewer1.Refresh();