how can pass parameter in crystal report in asp.net()c#

Link mentioend in Solution1 is broken now !!, can u please update link ?

This solution is worked for me.

// Declare Variable for Report Document

static ReportDocument rpt = new ReportDocument();

// Load Report Document with proper report file location
ReportFileName = Server.MapPath(@"RPTGenerateTariffWiseSalesReport.rpt");
rpt.Load(ReportFileName, OpenReportMethod.OpenReportByTempCopy);

//Initialise & Assign Parameter Values
DateTime TodaysDate;
string CompanyCode;

CompanyCode = SearchParams["CompanyCode"].ToString();
TodaysDate = DateTime.Parse(SearchParams["TodaysDate"].ToString());

//Pass Parameter Values in Report using setParameterValues
rpt.SetParameterValue("@CompanyCode", CompanyCode);
rpt.SetParameterValue("@TodaysDate", TodaysDate);

// Assign new ReportDocument to ReportViewer as Report Source
TariffWiseSalesReportViewer.ReportSource = rpt;

//Refresh Report
TariffWiseSalesReportViewer.RefreshReport();