MARKUS

                FileInfo TestFile = new FileInfo(System.IO.Path.GetTempFileName());

                PdfReader pdfReader = new PdfReader(tempFileInfo);

                {

                    var mediaBox = pdfReader.GetPageSize(i);

                    var cropbox = pdfReader.GetCropBox(i);

                var memStream = new MemoryStream();

                var stamper = new PdfStamper(pdfReader, memStream)

                {

                };

                stamper.Close();

                pdfReader.Close();

                var array = memStream.ToArray();