Passing parameter from windows application to SSRS Report.

Hi,

I am very new in SSRS. I want to passing parameter from windows

appln to SSRS.

-> select * from dbo.Employee where isActive = @active

query in my ssrs report.

-> in VS 2010 button click event.

rptViewer.ServerReport.ReportServerUrl = new Uri(@"http://localhost/ReportServer");
rptViewer.ServerReport.ReportPath = "/Custom Report/Custom Tempalte1";
rptViewer.ProcessingMode = ProcessingMode.Remote;
rptViewer.RefreshReport();
ReportParameter[] reportParameterCollection = new ReportParameter[1];
reportParameterCollection[0] = new ReportParameter("active", "1");
this.rptViewer.ServerReport.SetParameters(reportParameterCollection);
rptViewer.ShowParameterPrompts = false;
rptViewer.ServerReport.Refresh();

here i am passing parameter(active) to '1' but it is not working for me. ie) it is not produce report for active = '1' .
what is wrong this . please kindly help me.

Thanks & Regards
Narayanan P