Sub Report In Crystal Report

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C#

Hello Experts,
I want to add sub report in crystal Report. I have added the sub report in the design part but I am getting exception missing parameter value. I dnt how to write code behind in existing code .
Please help me in writing code behind for sub report.

My code behind for main crystal report is :-

CREngine.ReportDocument reportDoc = new CREngine.ReportDocument();
try
{
ConnectionInfo conInfo = new ConnectionInfo();
if (conn.DataSource.Equals("72.18.131.163,1533"))
{
conInfo.ServerName = "72.18.131.163,1533";
conInfo.DatabaseName = "DedStaffApproval";
conInfo.UserID = "prabodh";
conInfo.Password = "prabodh$123";
}
else
{
conInfo.DatabaseName = "DedStaffApproval";
conInfo.IntegratedSecurity = true;
conInfo.ServerName = "SAHDEV";
}
//conInfo.ServerName = "SAHDEV";
////conInfo.ServerName = "acer";
//conInfo.DatabaseName = "DedStaffApproval";
////conInfo.IntegratedSecurity = true;
////conInfo.UserID = "";
////conInfo.Password = "";

reportDoc.Load(Server.MapPath(Path.Combine("Reports", "prapatraAB.rpt")));
this.CrystalReportViewer1.ReportSource = reportDoc;

reportDoc.SetParameterValue("@yearid", yearid);
reportDoc.SetParameterValue("@collegeid", cmbcollege.SelectedValue);

reportDoc.DataDefinition.FormulaFields["Cyear1"].Text = "'" + c1 + "'";
reportDoc.DataDefinition.FormulaFields["Cyear2"].Text = "'" + c2 + "'";
reportDoc.DataDefinition.FormulaFields["Pyear1"].Text = "'" + p1 + "'";
reportDoc.DataDefinition.FormulaFields["Pyear2"].Text = "'" + p2 + "'";
reportDoc.DataDefinition.FormulaFields["region"].Text = "'" + rg + "'";
reportDoc.DataDefinition.FormulaFields["letnodate"].Text = "'" + letdate + "'";
reportDoc.DataDefinition.FormulaFields["varIO"].Text = "'" + VarIO + "'";
reportDoc.DataDefinition.FormulaFields["gdate"].Text = "'" + txtdate.Text + "'";
reportDoc.DataDefinition.FormulaFields["head"].Text = "'" + head + "'";
CREngine.Tables rptTables = reportDoc.Database.Tables;

foreach (CREngine.Table rptTbl in rptTables)
{
TableLogOnInfo repTblLogonInfo = rptTbl.LogOnInfo;
repTblLogonInfo.ConnectionInfo = conInfo;
rptTbl.ApplyLogOnInfo(repTblLogonInfo);
}

this.CrystalReportViewer1.ReportSource = reportDoc;
this.CrystalReportViewer1.DataBind();
CrystalReportViewer1.Visible = true;
CrystalReportViewer1.Width = 100;



ExportOptions exportOpts = new ExportOptions();
PdfRtfWordFormatOptions pdfOpts = ExportOptions.CreatePdfRtfWordFormatOptions();
exportOpts.ExportFormatType = ExportFormatType.PortableDocFormat;
exportOpts.ExportFormatOptions = pdfOpts;
reportDoc.ExportToHttpResponse(exportOpts, Response, false, "Report");



//this.CrystalReportViewer1.ReportSource = reportDoc;
//this.CrystalReportViewer1.DataBind();
//reportDoc.ExportToHttpResponse(ExportFormatType.PortableDocFormat, this.Response, true, "rptprapatraAB");

}
catch (Exception ex)
{

}
finally
{
reportDoc.Dispose();
reportDoc.Close();
CrystalReportViewer1.Dispose();
}