To Add Parameter to RDLC report.
1. Open report in Visual Studio.
2. Press CRL + ALT + D
3. "Report Data" tab gets open.
4. Select "Parameter" and right click to add parameter.
In Set parameter
ReportParameter[] rptParams = new ReportParameter[]
{
new ReportParameter("param1",txtParam1.Text),
new ReportParameter("param2",txtParam2.Text)
};
rptInvoiceTC.LocalReport.SetParameters(rptParams);