Add page number and order by column in diferent pages on itextshap pdf

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C#

itextsharp

Hello to all

Im trying to know about itextsharp, i have the next code to make a PDF from my datagrid, and it Works, but i need to add two news improvements on it and i dont know how,

first is to add the page number in the PDF before its créate,
second is to group ítems by one column and when the ítem is different show this row/rows in a new page, something like group row by colum in diferent pages.

Someone could help me with this? thanks in advance.

private void button2_Click(object sender, EventArgs e)
        {
            exportgridtopdf(dataGridView1, "test");
        }
        public void exportgridtopdf(DataGridView dataGridView1, string filename)
        {
            BaseFont bf = BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1250, BaseFont.EMBEDDED);
            PdfPTable pdftable = new PdfPTable(dataGridView1.Columns.Count);
            pdftable.HeaderRows = dataGridView1.Columns.Count;       
            pdftable.DefaultCell.Padding = 3;
            pdftable.WidthPercentage = 100;
            pdftable.HorizontalAlignment = Element.ALIGN_LEFT;
            pdftable.DefaultCell.BorderWidth = 1;            
            iTextSharp.text.Font text = new iTextSharp.text.Font(bf, 10, iTextSharp.text.Font.NORMAL);
            //add header
            foreach (DataGridViewColumn column in dataGridView1.Columns)
            {
                PdfPCell cell = new PdfPCell(new Phrase(column.HeaderText,text));
                cell.BackgroundColor = new iTextSharp.text.BaseColor(240, 240, 240);
                pdftable.AddCell(cell);
            }
            //add datarow
            foreach (DataGridViewRow row in dataGridView1.Rows)
            {
                foreach (DataGridViewCell cell in row.Cells)
                {                    
                    pdftable.AddCell(new Phrase(cell.Value.ToString(), text));
                }
            }
            var savefiledialoge = new SaveFileDialog();
            savefiledialoge.FileName = filename;
            savefiledialoge.DefaultExt = ".pdf";            
            if (savefiledialoge.ShowDialog()==DialogResult.OK)
            {
                using (FileStream stream = new FileStream(savefiledialoge.FileName, FileMode.Create))
                {
                    try
                    {
                        PdfWriter writer = PdfWriter.GetInstance(pdfdoc, stream);
                        pdfdoc.SetPageSize(PageSize.A4.Rotate()); // horizontal
                        pdfdoc.Open();
                        Ehead();           
                        pdfdoc.Add(pdftable);
                        pdfdoc.Close();
                        stream.Close();                        
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message, "error occured ", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }

                    MessageBox.Show("Downloaded","", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
        }
        private void Ehead()
        {
            var parrafo = new Paragraph("WHAREHOUSES");
            parrafo.SpacingBefore = 20;
            parrafo.SpacingAfter = 0;
            parrafo.Alignment = 1; //0-Left, 1 middle,2 Right
            pdfdoc.Add(parrafo);

            var parrafo3 = new Paragraph("ORDERS"  Date:" + DateTime.UtcNow);
            parrafo3.SpacingBefore = 1;
            parrafo3.SpacingAfter = 8;
            parrafo3.Alignment = 1; //0-Left, 1 middle,2 Right
            pdfdoc.Add(parrafo3);
        }

What I have tried:

i spend sometime with

PageEventHelper

, colspan, rowspan..but i dont find the solution...