Export crystal to pdf error

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i want to export crystal report to pdf i want to display i am getting error Invalid report file path. while exporting
i am using this code

protected void Button2_Click(object sender, EventArgs e)
   {
       string query;

       //    string q = Request.QueryString["q"];
       con.Open();
       query = "select * from Tech_data where id ='" + TextBox1.Text + "'";
       cmd = new SqlCommand(query, con);
       da = new SqlDataAdapter(cmd);
       dt.Clear();
       da.Fill(dt);
       if (dt.Rows.Count > 0)
       {

          // ReportDocument Report = new ReportDocument();
           cryRpt.Load(Server.MapPath("~/CrystalReport.rpt"));
           cryRpt.SetDataSource(dt);
           //query = "select * from Tech_data where id ='" + TextBox1.Text + "'";
           //cmd = new SqlCommand(query, con);
           //da = new SqlDataAdapter(cmd);
           //dt1.Clear();
           //da.Fill(dt1);
           cryRpt.SetDatabaseLogon("sa", "123456789", @"TRAINING-ROOM-8", "Technical_sup");
           CrystalReportViewer1.ReportSource = cryRpt;
           CrystalReportViewer1.DataBind();
           CrystalReportViewer1.RefreshReport();
       }
       con.Close();
   }
   protected void btnShow_Click(object sender, EventArgs e)
   {
       ExportOptions CrExportOptions;
       DiskFileDestinationOptions CrDiskFileDestinationOptions = new DiskFileDestinationOptions();
       PdfRtfWordFormatOptions CrFormatTypeOptions = new PdfRtfWordFormatOptions();
       CrDiskFileDestinationOptions.DiskFileName = pdfFile;
       CrExportOptions = cryRpt.ExportOptions;    <<<--- ERROR
       CrExportOptions.ExportDestinationType = ExportDestinationType.DiskFile;
       CrExportOptions.ExportFormatType = ExportFormatType.PortableDocFormat;
       CrExportOptions.DestinationOptions = CrDiskFileDestinationOptions;
       CrExportOptions.FormatOptions = CrFormatTypeOptions;
       cryRpt.Export();
   }