how to add tha same heading in pdf if the pdf consists more than oone page in c# + itextsharp?

i have created a pdf of more than one page. and i want the heading at every page..but i cant do it...how to do this???please help me out....

my code is...

imgPDF.Visible = true;
Label1.Visible = true;
label16.Visible = true;
label17.Visible = true;
string txt1 = txtfromdate.Text;
DateTime dt1 = Convert.ToDateTime(txt1);
string txt2 = txttodate.Text;
DateTime dt2 = Convert.ToDateTime(txt2);
decimal ttsl = 0, ttrbt = 0;
// int membrcnt=0;
DataTable dt = objComapniesBL.FetchOtherReportsByDate(Convert.ToInt32(Session["ID"]), dt1.ToString("yyyy-MM-dd"), dt2.ToString("yyyy-MM-dd"));
int membrcnt = dt.Rows.Count;
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{

ttsl = ttsl + Convert.ToDecimal(dt.Rows[i]["salesAmount"]);
ttrbt = ttrbt + Convert.ToDecimal(dt.Rows[i]["rebateamount"]);
}
lblmember.Text = membrcnt.ToString();
grdsupplierothers.DataSource = dt;
grdsupplierothers.DataBind();

lblTotalSales.Text = ttsl.ToString();
lblTotalRebate.Text = ttrbt.ToString();

}
}

protected void imgPDF_Click(object sender, ImageClickEventArgs e)
{

string txt1 = txtfromdate.Text;
DateTime dt1 = Convert.ToDateTime(txt1);
string txt2 = txttodate.Text;
DateTime dt2 = Convert.ToDateTime(txt2);
DataTable dt = objComapniesBL.FetchOtherReportsByDate(Convert.ToInt32(Session["ID"]), dt1.ToString("yyyy-MM-dd"), dt2.ToString("yyyy-MM-dd"));

Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attchment;filename=" + dt1.ToString("yyyy-MM-dd") + "through" + dt2.ToString("yyyy-MM-dd") + ".pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);

Document myDoc = new Document(PageSize.A4);

PdfWriter.GetInstance(myDoc, HttpContext.Current.Response.OutputStream);
myDoc.Open();

Phrase phrase1 = new Phrase(Environment.NewLine);
myDoc.Add(phrase1);

Paragraph p1 = new Paragraph("Evergreen Marketing Group - Marketing Allowance Report", FontFactory.GetFont(FontFactory.TIMES_ROMAN, 18, Font.NORMAL, new BaseColor(255, 0, 0)));
p1.Alignment = Element.ALIGN_CENTER;
myDoc.Add(p1);

Paragraph p2 = new Paragraph("Detailed Sales Report for" + " " + dt1.ToString("yyyy-MM-dd") + "through" + dt2.ToString("yyyy-MM-dd"), FontFactory.GetFont(FontFactory.TIMES_ROMAN, 12, Font.NORMAL));
p2.Alignment = Element.ALIGN_CENTER;
myDoc.Add(p2);

Paragraph p3 = new Paragraph(Session["CompanyName"].ToString(), FontFactory.GetFont(FontFactory.TIMES_ROMAN, 14, Font.NORMAL));
p3.Alignment = Element.ALIGN_CENTER;
myDoc.Add(p3);

myDoc.Add(phrase1);










BaseFont fonsize = BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1252, false);
Font newFont = new Font(fonsize, 12, Font.BOLD, BaseColor.DARK_GRAY);

BaseFont fonsize2 = BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1252, false);
Font newFont1 = new Font(fonsize2, 12, Font.BOLD, BaseColor.DARK_GRAY);
myDoc.Add(new Paragraph());
myDoc.Add(new Paragraph());
myDoc.Add(phrase1);

PdfPTable gridTable = new PdfPTable(grdsupplierothers.Columns.Count);

StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
StringReader sr = new StringReader(sw.ToString());

grdsupplierothers.Style.Add("width", "800px");
grdsupplierothers.HeaderRow.Style.Add("font-size", "14px");
grdsupplierothers.HeaderRow.Style.Add("font-weight", "bold");
grdsupplierothers.Style.Add("border", "1px solid bla