protected void Page_Init(object sender, EventArgs e) {      ConfigureCrystalReport();  } protected void Page_Unload(object sender, EventArgs e)  {          if (rptDocument == null)             return;            rptDocument.Close();            rptDocument.Dispose();   } private void ConfigureCrystalReport() {     string temp = BusinessObject.Util.Decrypt(Request.QueryString["toid"]);     TourOrderId = Util.ConvertTo<int>(temp, 0);     if (ViewState["reportdoc"] == null)     {  string report_path = "";  report_path = Server.MapPath("~/Report/TourNote.rpt");  DataSet ds = BusinessObject.TourOrders.GetTourNoteDsRpt(TourOrderId);  if (ViewState["reportdata"] == null)  {      ViewState["reportdata"] = ds;  }  else  {      ds = (DataSet)ViewState["reportdata"];  }  rptDocument = new ReportDocument();  rptDocument.Load(report_path);  rptDocument.SetDataSource(ds);  rptDocument.PrintOptions.PaperSize = CrystalDecisions.Shared.PaperSize.DefaultPaperSize;  ViewState["reportdoc"] = rptDocument;     }     else     {  rptDocument = (ReportDocument)ViewState["reportdoc"];     }       this.CrystalReportViewer1.ReportSource = rptDocument;     this.CrystalReportViewer1.HasToggleGroupTreeButton = false;     this.CrystalReportViewer1.DisplayGroupTree = false; }