How Do I Passing Parameter To Rdlc Report

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C#5.0

Hello everyone,

I am trying to pass parameter from a combo box to my rdlc report, below is my code:

private void ReportData( string schname)
  {
      DataSet4TableAdapters.NotStartedRegTableAdapter ta = new     DataSet4TableAdapters.NotStartedRegTableAdapter( );
      DataSet4.NotStartedRegDataTable dt = new DataSet4.NotStartedRegDataTable( );
      ta.Fill( dt, schname );
      ReportDataSource rds = new ReportDataSource( );
      rds.Name = "DataSet4";
      rds.Value = dt;
      //Microsoft.Reporting.WinForms.ReportDataSource reportDataSource4 = new Microsoft.Reporting.WinForms.ReportDataSource( "DataSet4", dt.AsEnumerable( ).CopyToDataTable( ) );
      ReportParameter rp = new ReportParameter( "schoolName", schname );

      reportViewer1.LocalReport.DataSources.Clear( );
      reportViewer1.LocalReport.ReportPath = "Report4.rdlc";
      reportViewer1.LocalReport.SetParameters( new ReportParameter[] { rp } );
      reportViewer1.LocalReport.DataSources.Add( rds );
      reportViewer1.LocalReport.Refresh( );
  }

The calling method:

ReportData(cboSchools.Text );

its not reporting any error, but the report is not loaded, is there anything i am missing?