Thanks for your guidance
I have used the below code to achieve my target
Code:
// Add LOGO inside pdf
string filename = Server.MapPath("~/Uploads/") + FileUpload1.FileName.ToString();
FileUpload1.SaveAs(filename);
PdfDocument document = PdfReader.Open(filename);
// Set version to PDF 1.4 (Acrobat 5) because we use transparency.
if (document.Version < 14)
document.Version = 14;
for (int idx = 0; idx < document.Pages.Count; idx++)
{
PdfPage page = document.Pages[idx];
XGraphics gfx = XGraphics.FromPdfPage(page, XGraphicsPdfPageOptions.Prepend);
string imgPath = System.Web.HttpContext.Current.Server.MapPath("Images/nals_logo.jpg");
XImage image = XImage.FromFile(imgPath);
gfx.DrawImage(image, 100, 200);
}
// Save the document...
document.Save(filename);
// ...and start a viewer
Process.Start(filename);