How to pass Parameter in Crystal report having two Sub report in C#.net and ASP.net

Hi All
   I created a report in Crystal Report and Bind with a storedprocedure which needs to parameter to executes. I want to pass it from Page_Load event of webpage to run and print report. Code is as bellow
 
Following code not worked and prompting pass for parameters before executing report
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ReportDocument rptDoc = new ReportDocument();
strReportPath = Server.MapPath(Session["REPORTNAME"].ToString());
 rptDoc.Load(strReportPath);
rptDoc.SetParameterValue(0, Request.QueryString["Val1"].ToString());
 rptDoc.SetParameterValue(1, Request.QueryString["Val2"].ToString());
 rptDoc.Refresh();

ConnectionInfo dbConnInfo = new ConnectionInfo();

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