Html table looses fomatting while converting to pdf

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ASP.NET

PDF

itextsharp

I am using Itextsharp.dll to convert html table to pdf. Pls find below my code.

aspx:

<asp:Panel ID="PnlTable" runat="server" ScrollBars="Horizontal" Width="707px" Visible="false">
<asp:Table ID="tbDynamic" CellPadding="2" CellSpacing="2" Width="100%" runat="server">
</asp:Table>
</asp:Panel>

<asp:Button ID="btnExport" runat="server" Text="Export" OnClick="btnExport_Click" />

cs :

protected void btnExport_Click(object sender, EventArgs e)
{
StringBuilder sb = new StringBuilder();
Label lb = new Label();
Table dt = new Table();
TableRow trow = new TableRow();
TableCell tcell = new TableCell();
LiteralControl l1 = new LiteralControl();

PnlTable.Visible = true;

sb.Append("<table style='width:100%;text-align:center' border='1'>");
sb.Append("<tr>");
sb.Append("<td>Index</td>");
sb.Append("</tr>");

sb.Append("<tr>");
sb.Append("<td>");
sb.Append("<table style='width:100%;' border='0'>");
sb.Append("<tr>");
sb.Append("<td>First</td>");
sb.Append("<td>Second</td>");
sb.Append("<td>Third</td>");
sb.Append("</tr>");

sb.Append("<tr>");
sb.Append("<td>Fourth</td>");
sb.Append("<td>Fifth</td>");
sb.Append("<td>Six</td>");
sb.Append("<tr>");

sb.Append("<tr>");
sb.Append("<td>Seven</td>");
sb.Append("<td>Eight</td>");
sb.Append("<td>Nine</td>");
sb.Append("</tr>");

sb.Append("</table>");

sb.Append("</td>");
sb.Append("</tr>");
sb.Append("</table>");

l1 = new LiteralControl(sb.ToString());
tcell.Controls.Add(l1);
trow.Controls.Add(tcell);
tbDynamic.Controls.Add(trow);

Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=Panel.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
PnlTable.RenderControl(hw);
StringReader sr = new StringReader(sw.ToString());
Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 100f, 0f);
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);

pdfDoc.Open();
htmlparser.Parse(sr);
pdfDoc.Close();
PnlTable.Visible = false;
Response.Write(pdfDoc);
Response.End();
}

Output i slike this

________________________________________________________
|- Index |
________________________________________________________
| First Second Third |

| Fourth Fifth Six |

| Seven Eight Nine |
________________________________________________________

I want to apply column line to inside table only not horizontal.If Apply border=1,It will apply border to row as well as column.How to apply that?I already tried rules="clos" and applied boder style to td.But it not working.It is working in html table.But when I converting to pdf,table looses formating

I want like this.

________________________________________________________
|- Index |
________________________________________________________
| First | Second | Third |

| Fourth | Fifth | Six |

| Seven | Eight | Nine |
________________________________________________________

Vertical line break here.I want continuous line