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void ConvertJPG2PDF(string jpgfile, string pdf)
{
 var document = new Document(iTextSharp.text.PageSize.A4, 25, 25, 25, 25);
 using (var stream = new FileStream(pdf, FileMode.Create, FileAccess.Write, FileShare.None))
 {
  PdfWriter.GetInstance(document, stream);
  document.Open();
  using (var imageStream = new FileStream(jpgfile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
  {
   var image = Image.GetInstance(imageStream);
   if (image.Height > iTextSharp.text.PageSize.A4.Height - 25)
   {
    image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25);
   }
   else if (image.Width > iTextSharp.text.PageSize.A4.Width - 25)
   {
    image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25);
   }
   image.Alignment = iTextSharp.text.Image.ALIGN_MIDDLE;
   document.Add(image);
  }
 
  document.Close();
 }
}