There are a couple of ways. I used strongly-typed reports, but you *should* be able to do something like this...

ReportDocument oMyReport = new ReportDocument();
oMyReport.Load("name of report");

// do your data stuff here

oReportViewer.ReportSource = oMyReport;

I'm typing from memory, I don't have my project in front of me, but give that a try...

Kevin