Several pdf pages in pdf document using pdfsharp

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C#

Hi
I want to add a page with its content each time I loop. but it just adds the last page with its data removing all previous data and pages. and the result is only 1 page.

I want to create pdf pages according to the loop

foreach(item in list){
PdfPage page = new PdfPage();
                                Size pageSize = bmp.Size;
                                page.Width = 1700;
                                page.Height = 1800;
                            
                               
                                document.AddPage(page);

                                XGraphics gfx = XGraphics.FromPdfPage(page);
                                gfx.DrawImage(bmp, 0, 0);

 using (MemoryStream memoryStream = new MemoryStream())
                    {
                        //Save the Watermarked image to the MemoryStream.
                        document.Save(memoryStream, false);

                        memoryStream.Position = 0;

                        //Start file download.
                        Response.Clear();
                        Response.ContentType = "application/pdf";
                        Response.AddHeader("Content-Disposition", "inline; filename=" + filename);

                        //Write the MemoryStream to the Response.
                        Response.BinaryWrite(memoryStream.ToArray());
                        memoryStream.Close();
                        Response.Flush();
                        Response.Close();
                        HttpContext.Current.ApplicationInstance.CompleteRequest();
                    }
}

Thanks in advance

What I have tried:

I used a pdfsharper .. looped over items in list
i write on images then convert it to pdf content.