You might want to try clearing the existing data sources first with Me.ReportViewer1.LocalReport.DataSources.Clear() and possibly in the form.designer.vb comment out the lines which would have been added if/when you selected the report using the ReportViewer Tasks box 'Dim ReportDataSource1 As Microsoft.Reporting.WinForms.ReportDataSource = New Microsoft.Reporting.WinForms.ReportDataSource and 'ReportDataSource1.Value = 'Me.ReportViewer1.LocalReport.DataSources.Add(ReportDataSource1) I have found that almost every problem I've had with report viewer not displaying the report was to do with data in some way or another. Have you confirmed that your adap.fill line is actually putting some records into the dataset? Hope this is of some help.