Drillthrough reportviewer

private DataTable LoadData()
      {
          DataSet catalogo = new DataSet();
          bf_mi_indicadores BFindicadores = new bf_mi_indicadores();
          DataSet ds = BFindicadores.mi_catalogografico(7, 0, 0, 0);
          return ds.Tables[0];
      }

      protected void rpt_catalogo_Drillthrough(object sender, DrillthroughEventArgs e)
      {
          Response.Write(Js.alert("Entro"));
          LocalReport localReport = (LocalReport) e.Report;

          ReportDataSource datasource = new ReportDataSource("CMIDataSet_prueba_pa_mi_catalogo_grafico", LoadData());
          localReport.DataSources.Clear();
          localReport.DataSources.Add(datasource);
          localReport.Refresh();
      }
      private void LoadReport(int id)
      {
          DataSet catalogo = new DataSet();
          bf_mi_indicadores BFindicadores = new bf_mi_indicadores();
          //int ids = NumInt.Init(id.Text);
          //DataSet ds = BFindicadores.mi_catalogografico(7, 0, 0, 0);
          DataSet ds = BFindicadores.mi_catalogo(id, 0, 0, 0);
          ReportDataSource datasource = new ReportDataSource("CMI_CATALOGO_pa_mi_catalogo_sel", ds.Tables[0]);
          rpt_catalogo.LocalReport.DataSources.Clear();
          rpt_catalogo.LocalReport.DataSources.Add(datasource);
          if (ds.Tables[0].Rows.Count == 0)
          {
              Response.Write(Js.alert("Rows.Count == 0"));
          }
          //rpt_catalogo.Drillthrough += new DrillthroughEventHandler(DemoDrillthroughEventHandler);
          rpt_catalogo.LocalReport.Refresh();
      }
      protected void Button1_Click(object sender, EventArgs e)
      {
          rpt_catalogo.Visible = true;
          int id_perspectiva = NumInt.Init(Request.QueryString["id_perspectiva"]);
          LoadReport(id_perspectiva);
      }