How Do I Add Aspx Controls Values In Pdf Document?

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C#

itextsharp

Here in my page i have one Textbox and one Button.When i enter the text in textbox and press Submit button the Textbox value will be added in Pdf Document like

Enter u r Name:Benz

but my problem is when i press the submit button the data will be append on above the image in PDF Document.i want to display in the middile of the Document.
pls help me....
My Code is

Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=Reports in PDF.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
 StringWriter sw = new StringWriter();
sw.Write(lbl1.Text + ":" + txt1.Text);
HtmlTextWriter hw = new HtmlTextWriter(sw);
this.Page.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();
Response.Write(pdfDoc);
Response.End();

it shows like
Name:BEnz
IMage
Nmae:
i want to display the textbox value in fron of Name.
pls Help me i search so many articles.but i didnt get answer.
pls help me.....