I am trying to geneartion QR Code in Crystal Report, but it is not showing

I followed below link,

Generate QR Code in ASP.Net Crystal Report using C# and VB.Net

protected void Page_Load(object sender, EventArgs e)
{
    //if (!IsPostBack)
    {
        rpt.Dispose();
        rpt.Close();
        loadReport();
 
    }
}
private void loadReport()
{
    SBprint.Dispose();
    rpt.Close();
    SqlConnection con = new SqlConnection();
    con = new SqlConnection("Data Source=server1\\SQLEXPRESS;Integrated Security=SSPI;Initial Catalog=SilverProduction;MultipleActiveResultSets=True;");
 
    try
    {
        con.Open();
        SqlCommand cmd = new SqlCommand("spSelectOrderDetail", con);
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.AddWithValue("@OrderNo", Request.QueryString["OID"]);
 
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet dt = new DataSet();
        da.Fill(dt);
 
        dt.Tables["Table"].Columns.Add(new DataColumn("QRCode", typeof(byte[])));
        foreach (DataRow dr in dt.Tables["Table"].Rows)
        {
            dr["QRCode"] = GenerateQrCode(dr["BalNo"].ToString());
        }
 
        rpt = new ReportDocument();
        SBprint.RefreshReport();
        rpt.Load(Server.MapPath("~/Bigbal.rpt"));
 
        rpt.SetDataSource(dt.Tables["Table"]);
 
        SBprint.ReportSource = rpt;
 
 
        rpt.ExportToHttpResponse(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat, Response, false, "Probale");
        rpt.Close();
        rpt.Dispose();
        con.Close();
    }
 
    catch (Exception ex)
    {
        rpt.Close();
        rpt.Dispose();
        con.Close();
    }
}
 
private byte[] GenerateQrCode(string qrmsg)
{
    string code = qrmsg;
    QRCodeGenerator qrGenerator = new QRCodeGenerator();
    QRCodeGenerator.QRCode qrCode = qrGenerator.CreateQrCode(code, QRCodeGenerator.ECCLevel.Q);
    System.Web.UI.WebControls.Image imgBarCode = new System.Web.UI.WebControls.Image();
    imgBarCode.Height = 150;
    imgBarCode.Width = 150;
    using (Bitmap bitMap = qrCode.GetGraphic(20))
    {
        using (MemoryStream ms = new MemoryStream())
        {
            bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
            byte[] byteImage = ms.ToArray();
            return byteImage;
        }
    }
}
protected void CRBigview_Unload(object sender, EventArgs e)
{
    try
    {
        rpt.Close();
        rpt.Dispose();
    }
    catch { }
}