[Solved] ASP.Net Image not displaying while exporting to PDF using iTextSharp

I have a web page where QR code is displayed on a document as an image. The document is in .pdf format.

When I click on a button, it should download the document with the QR image placed on the document, But the code I have is not working.

I clicked on the download button and the document downloaded but the QR code image was not on it

C# code

    public string GetUrl(string imagepath)
    {
        string[] splits = Request.Url.AbsoluteUri.Split('/');
        if (splits.Length >= 2)
        {
            string url = splits[0] + "//";
            for (int i = 2; i < splits.Length - 1; i++)
            {
                url += splits[i];
                url += "/";
            }
            return url + imagepath;
        }
        return imagepath;
    }

    public void generatePDF()
    {
        string fileName = "Invoice" + DateTime.Now.ToString() + ".pdf";

        Response.Clear();
        Response.ContentType = "Application/pdf";
        Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName + ";");
        HtmlConverter.ConvertToPdf(getPanelHtml(), Response.OutputStream);
        Response.Flush();
        Response.Close();
        Response.End();
    }

    public string getPanelHtml()
    {
        StringBuilder sb = new StringBuilder();
        StringWriter tw = new StringWriter(sb);
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        Panel1.RenderControl(hw);
        var html = sb.ToString();

        return html;
    }

    public string ToAbsoluteUrl(string relativeUrl)
    {
        if (string.IsNullOrEmpty(relativeUrl))
        {
            return relativeUrl;
        }
        if (relativeUrl.StartsWith("/"))
        {
            relativeUrl = relativeUrl.Insert(0, "~");
        }

        if (!relativeUrl.StartsWith("~/"))
        {
            relativeUrl = relativeUrl.Insert(0, "~/");
        }

        var url = HttpContext.Current.Request.Url;
        var port = url.Port != 80 ? (":" + url.Port) : String.Empty;

        return String.Format("{0}://{1}{2}{3}", url.Scheme, url.Host, port, VirtualPathUtility.ToAbsolute(relativeUrl));
    }

    protected void Button3_Click(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection("MyConnectionString");
        con.Open();
        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = "SELECT * FROM Table WHERE Id_no = '" + Session["Record"] + "'";
        cmd.Connection = con;
        SqlDataAdapter sda = new SqlDataAdapter();
        DataSet ds = new DataSet();
        sda.SelectCommand = cmd;
        sda.Fill(ds, "detail");
        if (ds.Tables[0].Rows.Count > 0)
        {
            byte[] image = (byte[])ds.Tables[0].Rows[0]["logo"];
            imgFileUpload.ImageUrl = "data:image/jpeg;base64," + Convert.ToBase64String(image);

            string fileName = "Receipt" + DateTime.Now.ToString() + ".pdf";

            byte[] QRBytes = GetQRCodeBytes(ToAbsoluteUrl("/ITdoc.aspx") + "?Id=" + Session["Record"]);
            Image1.ImageUrl = "data:image/jpg;base64," + Convert.ToBase64String(QRBytes);
            var ImgUrl = Image1.ImageUrl;
            var ImagUrl = imgFileUpload.ImageUrl;
            // Write image as file to folder.
            File.WriteAllBytes(ToAbsoluteUrl("qrimg.jpg"), QRBytes);
            File.WriteAllBytes(ToAbsoluteUrl("logo.jpg"), image);
            // convert and set absolute url in image.
            Image1.ImageUrl = GetUrl("qrimg.jpg");
            imgFileUpload.ImageUrl = GetUrl("logo.jpg");


            StringWriter sw = new StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(sw);
            Panel1.RenderControl(hw);
            StringReader sr = new StringReader(sw.ToString());
            Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 10f);
            PdfWriter PdfWriter = PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
            HtmlPipelineContext htmlContext = new HtmlPipelineContext(null);
            htmlContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory());
            ICSSResolver cssResolver = XMLWorkerHelper.GetInstance().GetDefaultCssResolver(false);
            cssResolver.AddCssFile(Server.MapPath("~/css/style2.css"), true);
            IPipeline pipeline = new CssResolverPipeline(cssResolver, new HtmlPipeline(htmlContext, new PdfWriterPipeline(pdfDoc, PdfWriter)));
            var worker = new XMLWorker(pipeline, true);
            var xmlParse = new XMLParser(true, worker);
            pdfDoc.Open();
            xmlParse.Parse(sr);
            xmlParse.Flush();
            pdfDoc.Close();
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment;filename=" + fileName + ";");
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.Write(pdfDoc);
            // Delete the temp image.
            File.Delete(ToAbsoluteUrl("qrimg.jpg"));
            File.Delete(ToAbsoluteUrl("logo.jpg"));
            Image1.ImageUrl = ImgUrl;
            imgFileUpload.ImageUrl = ImagUrl;
            Response.End();
        }
    }