Create editable form in pdf using iTextsharp , save contents of pdf form

using iTextSharp.text.xml;
using iTextSharp.text.pdf;
using iTextSharp.text;
 ...
	public void XmlToPdf(string xmlDoc, string strFilename)
		{
			Document document = new Document();
			MemoryStream os = new MemoryStream();
			PdfWriter instance = PdfWriter.GetInstance(document, os);
	
			StringReader input = new StringReader(xmlDoc);
			XmlTextReader reader = new XmlTextReader(input);
			ITextHandler handler = new ITextHandler(document);
			try
			{
				handler.Parse(reader);
			}
			catch (Exception exception)
			{
				os.Close();
				throw exception;
			}
			finally
			{
				reader.Close();
				input.Close();
			}
			FileStream output = new FileStream(strFilename, FileMode.Create);
			BinaryWriter writer2 = new BinaryWriter(output);
			writer2.Write(os.ToArray());
			writer2.Close();
			output.Close();
			os.Close();
		}