How To Create Bill in crystal report

Anit :Thanks for Solution

I tried with your Idea but I'm getting only second table values in sub report.
And no any value in Main report....

Below is my code wht I tried:
SqlDataAdapter da = q.fillbill(bill);
da.Fill(ds1, "billtable");

//dt1.Clear();
//da.Fill(dt1);
if (dt.Rows.Count > 0)
{
//Assign data to the primary report
// CrystalReport1 RptDoc = new CrystalReport1();
ReportDocument RptDoc = new ReportDocument();
RptDoc.Load("C:\\Users\\Sunlogic\\Documents\\Visual Studio 2008\\Projects\\My Stock\\My Stock\\CrystalReport1.rpt");
RptDoc.SetDataSource(ds1);


SqlDataAdapter da1 = q.fillcurrentsale();
da1.Fill(ds2, "saletable");
//dt2.Clear();
//da.Fill(dt2);
q.disconnect();
//Get sub report and assign datatable1 to that report
foreach (ReportObject repOp in RptDoc.ReportDefinition.ReportObjects)
{
if (repOp.Kind == ReportObjectKind.SubreportObject)
{
string SubRepName = ((SubreportObject)repOp).SubreportName;
ReportDocument subRepDoc = RptDoc.Subreports[SubRepName];
subRepDoc.SetDataSource(ds2);
}
}
//Assign report to the crystal report viewer
billp.crystalReportViewer1.ReportSource = RptDoc;
// billp.crystalReportViewer1.DataBind();

}