Why few rpt field data not coming while exporting to PDF/excel from crystal report in ASP.NET with C#?

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C#

ASP.NET

CrystalReports

I am showing data in the Crystal Report. In the crystal report entire rpt field data is coming fine. But while exporting to PDF/Excel few rpt field data are not coming . I am using asp.net with c#. I am using Crystal report with version 10.5.3700.0

What I have tried:

My Code is as below:

ReportDocument reportDocument;
   int selectedDB = 0;
   protected void Page_Load(object sender, EventArgs e)
   {
       try
       {
           // -- Modified by Yahudha James on 15th July 2019 for DDS Enhancements 2017 -- // -- BEGIN -- //
           foreach (Control div in Master.FindControl("DDSEdgeHeader1").Controls)
           {
               if (div.GetType().Name == "HtmlGenericControl" && div.ID == "divDB")
               {
                   foreach (Control rb in div.Controls)
                   {
                       if (rb.GetType().Name == "RadioButtonList" && rb.ID == "rbDatabase")
                       {
                           RadioButtonList rbDatabase = (RadioButtonList)rb;
                           selectedDB = Convert.ToInt32(rbDatabase.SelectedValue);
                       }
                   }

               }
           }
           // -- Modified by Yahudha James on 15th July 2019 for DDS Enhancements 2017 -- // -- END -- //
           //check for valid user
           //if (!IsLoggedIn)
           //    return;
            if (!IsPostBack)
           {
               ClearControl();
               PopulateBank();
               PopulateInstructionCode();

           }
           else
           {
               if (validation())
                   ViewReport();
           }



       }
       catch (Exception ex)
       {
           Common.handleErrorLog(ex);
       }
   }

#region CrystalReportCtrlSettings
  /// <summary>
  /// CrystalReportCtrlSettings
  /// </summary>
  /// <param name="CrptViewReport"></param>
  private void CrystalReportCtrlSettings(CrystalReportViewer CrptViewReport)
  {
      CrptViewReport.HasGotoPageButton = false;
      CrptViewReport.DisplayGroupTree = false;
      CrptViewReport.HasGotoPageButton = false;
      CrptViewReport.HasSearchButton = false;
      CrptViewReport.HasDrillUpButton = false;
      CrptViewReport.HasViewList = false;
      CrptViewReport.Width = 0;

      CrptViewReport.HasCrystalLogo = false;
      CrptViewReport.HasToggleGroupTreeButton = false;
      CrptViewReport.HasZoomFactorList = false;
      CrptViewReport.Zoom(90);
      Style stlCRV = new Style();
      stlCRV.Width = Common.RPT_WIDTH_LANDSCAPE;
      CrptViewReport.ToolbarStyle.MergeWith(stlCRV);

  }
  #endregion

#region View Report
   /// <summary>
   /// Function to view the report
   /// </summary>
   protected void ViewReport()
   {
       try
       {
           //Setting the crystal report controls.
           CrystalReportCtrlSettings(CRVRUserListReport);
           //set the report path
           string reportPath = Server.MapPath("~//Reports//OutwardDDASummaryReport.rpt");
           BLL_MISReports objclass = new BLL_MISReports();

           string FromDate = DateTime.ParseExact(txtStartDate.Value.Trim(), "dd/MM/yyyy", CultureInfo.InvariantCulture).ToString("yyyy/MM/dd");
           string ToDate = DateTime.ParseExact(txtEndDate.Value.Trim(), "dd/MM/yyyy", CultureInfo.InvariantCulture).ToString("yyyy/MM/dd");
           //COmmented and Added on 21-12-15 for BusinessChanges
           string ContractRefNo = txtContractReferenceneNo.Value;
           string Accno = txtAccountNo.Value;
           //DataSet ds = objclass.getOutwardDDASummaryReport(ddlPayingBankId.SelectedValue, drdInstructionCode1.SelectedValue,FromDate, ToDate);
           DataSet ds = objclass.getOutwardDDASummaryReport(ddlPayingBankId.SelectedValue, drdInstructionCode1.SelectedValue, FromDate, ToDate, ContractRefNo,selectedDB,Accno,txtNBCPDFRefNo.Value);

           DataTable dt = new DataTable();
           if (ds.Tables[0].Rows.Count > 0)
           {
               dt = ds.Tables[0];
               CRVRUserListReport.Visible = true;
           }
           else
           {
               CRVRUserListReport.Visible = false;
               Common.showMessage("No Records Found", this);
               return;
           }

           //--Initializing CrystalReport
           reportDocument = new ReportDocument();
           reportDocument.Load(reportPath);
           reportDocument.SetDataSource(dt);

           //Passing Date Criteria for display in Report header
           reportDocument.SetParameterValue("@FromDate", txtStartDate.Value);
           reportDocument.SetParameterValue("@ToDate", txtEndDate.Value);
           reportDocument.SetParameterValue("@PrintUser",  Session["USER_NAME"].ToString());
           if (ddlPayingBankId.SelectedIndex > 0)
           {
               reportDocument.SetParameterValue("@PayingBankID", ddlPayingBankId.SelectedItem.Text);
           }
           else
           {
               reportDocument.SetParameterValue("@PayingBankID", "");
           }

           if (drdInstructionCode1.SelectedIndex > 0)
           {
               reportDocument.SetParameterValue("@InstructionCode", drdInstructionCode1.SelectedItem.Text);
           }
           else
           {
               reportDocument.SetParameterValue("@InstructionCode", "");
           }


           //--Binding report with CrystalReportViewer
           CRVRUserListReport.ReportSource = reportDocument;
           CRVRUserListReport.DataBind();

       }
       catch (Exception ex)
       {
           Common.handleErrorLog(ex);
       }
   }
   #endregion