string pdfPath = Server.MapPath("~/ViewPatPdf.pdf");

                PDDocument doc = PDDocument.load(pdfPath);

                PDFTextStripper stripper = new PDFTextStripper();

                string txt = stripper.getText(doc);

                Response.Write(txt);

 public string ReadPdfFile(string fileName)

        {

            StringBuilder text = new StringBuilder();

            PdfReader pdfReader = new PdfReader(fileName);

            for (int page = ; page <= pdfReader.NumberOfPages; page++)

            {

                ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();

                string currentText = PdfTextExtractor.GetTextFromPage(pdfReader, page, strategy);

                currentText = Encoding.UTF8.GetString(ASCIIEncoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(currentText)));

                text.Append(currentText);

            }

            pdfReader.Close();

            return text.ToString();

        }