How to Export HTML string to PDF file using iTextSharp DLL in C#

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<form id="form1" runat="server">
    <div id = "Studenttable">
     <table style="border:solid 1px;">
        <tr>
            <th>Student Id</th>
            <th>Student Name</th>
            <th>Student Branch</th>
        </tr>
        <tr>
            <td>1</td>
            <td>John Smith</td>
            <td>Computer Engineering</td>
        </tr>
        <tr>
            <td>2</td>
            <td>David Jones</td>
            <td>Civil Engineering</td>
        </tr>
        <tr>
            <td>3</td>
            <td>Michael	Johnson</td>
            <td>Chemical Engineering</td>
        </tr>
        <tr>
            <td>4</td>
            <td>Chris Lee</td>
            <td>Electrical Engineering</td>
        </tr>
         <tr>
            <td>5</td>
            <td>Mike Brown</td>
            <td>Computer Engineering</td>
        </tr>

        
    </table></div>
        <br />
        <asp:HiddenField ID="hfGridHtml1" runat="server" OnValueChanged="hfGridHtml_ValueChanged" />
<asp:Button ID="btnExport" runat="server" Text="Export To PDF File" OnClick="ExportToPDF" />


        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        $("[id*=btnExport]").click(function () {
            $("[id*=hfGridHtml1]").val($("#Studenttable").html());
        });
    });
</script>
    
    </form>

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   StringReader sr = new StringReader(Request.Form[hfGridHtml1.UniqueID]);
            Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
            PdfWriter writer = PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
            pdfDoc.Open();
            XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, sr);
            pdfDoc.Close();
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment;filename=StudentDetails.pdf");
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.Write(pdfDoc);
            Response.End();