Don’t connect ReportViewer directly to your database.

Instead, load a DataSet first, then bind it to your report:

Dim cr As New ReportDocument()

cr.Load(Server.MapPath("~/CustomerReport.rpt"))

cr.SetDataSource(GetData())

This gives you better control over data loading and display.

For an even easier solution, try https://github.com/siteknower/crystisAspNet

It shows .rpt files in your app without installing Crystal Reports—just convert your data to JSON before printing.