How to apply borders to pdf page using asp.net?

public void pdf()
{
    iTextSharp.text.html.simpleparser.StyleSheet styles = new iTextSharp.text.html.simpleparser.StyleSheet();
    PdfPTable table = new PdfPTable(3);
    table.TotalWidth = 400f;
    Document document = new Document(PageSize.A2, 88f, 88f, 10f, 10f);

    MemoryStream memoryStream = new MemoryStream();

    PdfWriter writer = PdfWriter.GetInstance(document, memoryStream);
    document.Open();
    PdfContentByte content = writer.DirectContent;
    iTextSharp.text.Rectangle rectangle = new iTextSharp.text.Rectangle(document.PageSize);
    rectangle.Left += document.LeftMargin;
    rectangle.Right -= document.RightMargin;
    rectangle.Top -= document.TopMargin;
    rectangle.Bottom += document.BottomMargin;

    content.SetColorStroke(iTextSharp.text.BaseColor.BLUE);
    content.Rectangle(rectangle.Left, rectangle.Bottom, rectangle.Width, rectangle.Height);
    content.Stroke();            

    Response.ContentType = "application/pdf";
    Response.AddHeader("content-disposition", "attachment;filename=Invoice.pdf");
    Response.Cache.SetCacheability(HttpCacheability.NoCache);

    StringWriter stringWriter = new StringWriter();
    HtmlTextWriter htmlTextWriter = new HtmlTextWriter(stringWriter);

    divM.RenderControl(htmlTextWriter);
    StringReader sr = new StringReader(stringWriter.ToString());
  //  Document doc = new Document(PageSize.A2, 7f, 7f, 7f, 0f);

    HTMLWorker htmlparser = new HTMLWorker(document);
    htmlparser.SetStyleSheet(styles);
    PdfWriter.GetInstance(document, Response.OutputStream);
    document.Open();
    htmlparser.Parse(sr);
    document.Close();
    Response.Write(document);
    Response.End();
}

styles.LoadStyle("pdf", "border", "1");

styles.LoadStyle("pdf", "border-top", "1");
   styles.LoadStyle("pdf", "border-bottom", "1");
   styles.LoadStyle("pdf", "border-left", "1");
   styles.LoadStyle("pdf", "border-right", "1");
   styles.LoadStyle("pdf", "size", "4");