They said it could not be done.
But here is the code to set a Local Report Parameter at runtime

”’ <summary>
”’ METHOD How to set Report Parameter
”’ </summary>
”’ <param name="MyReportViewer"></param>
”’ <param name="sParameterName"></param>
”’ <param name="sParameterText"></param>
”’ <remarks></remarks>

Private Sub SetLocalReportParameter(ByVal MyReportViewer As Microsoft.Reporting.WinForms.ReportViewer, ByVal sParameterName As String, ByVal sParameterText As String)

Try
Dim rp As New ReportParameter(sParameterName, sParameterText)
Dim rpP() As ReportParameter = {rp}
With MyReportViewer
.LocalReport.SetParameters(rpP)
.RefreshReport()
End With

Catch ex As Exception
MessageBox.Show(ex.Message)
End Try

End Sub