Crystal Report Can't Show data of particular table

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C#3.0

C#

Windows

I use following code to populate data in crystal report viewer, when i design report in crystal report, the data is show when i preview, but when use crystal report viewer using following c# code, the data can't show and no any error fetch, this problum is occur only few table, other table report run properly, plz help, i can't understand what can i do.

class RptView
    {
        private ReportDocument rptDoc;
        private ParameterField Parameter;
        private ParameterFields Parameters;
        private ParameterDiscreteValue ParaValue;
        private Connection cnn;



        public void ViewReport(CrystalReportViewer CRViewer, string rptName, Forms.ReportView frm, string ParName, Object ParValue)
        {
            try
            {
              
                cnn = new Connection();
                cnn.ConnectionString();

                rptDoc = new ReportDocument();
                rptDoc.Load(Application.StartupPath + "\\Reports\\" + rptName);
                //rptDoc.Load(Path.GetPathRoot(Application.StartupPath) + "\\Reports\\" + rptName);

                Parameter = new ParameterField();
                Parameter.Name = ParName;
                
                ParaValue = new ParameterDiscreteValue();
                ParaValue.Value = ParValue;

                Parameters = new ParameterFields();
                Parameter.CurrentValues.Add(ParaValue);
                Parameters.Add(Parameter);

                rptDoc.SetDataSource(cnn.ConString());
                rptDoc.Refresh();
                rptDoc.SummaryInfo.ReportAuthor = "";
                CRViewer.ParameterFieldInfo = Parameters;
                CRViewer.ReportSource = rptDoc;
                frm.ShowDialog();

               

            }
            catch(Exception e1) 
            {
                MsgBox.MyMessageBox.ShowBox(e1.Message);
            }

        }

        
        }
    }

Call the report as follows

private void itemStockToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ReportView frm = new ReportView();
            RptView rptV = new RptView();

            rptV.ViewReport(frm.CRV, "ItemStock.rpt", frm);
        }