Parameters are not working passing to a crystal reports from vb.net -


I am using this code to pass parameters into your Crystal Reports say, but Crystal Reports runtime input parameters . Please help me to resolve it 

  new RPT_Maintenance rpt.SetDataSource as Dim rpt (maintenanceDetailsTable) rpt.SetParameterValue ( "datefrom", dtpDateFrom.Text) rpt.SetParameterValue ( "dateto" , DtpDateTo.Text) Rpt.SetParameterValue ( "cat", "all Vehicles") FRM_ReportViewer.CrystelReportViewer.ReportSource = rpt FRM_ReportViewer.ShowDialog () FRM_ReportViewer.Dispose ()    
 
 
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