Using Crystal Report in ASP.NET is not a big deal. If you have Report (.rpt) File ready, you can use it in your Web Page straight way.
# First of all, add a CrystalReportViewer to your Page.
# In the Page_Init Event of your Page, attach your Report (.rpt) File and set Data Source for it.
# Finally, set CrystalReportViewer Report Source.