public Test()
        {
            var sb = SBReadPdfToOutputFile(@"C:\Users\Global\Downloads\LA30AA(US).pdf");
            ReadPdfToOutputFile(@"C:\Users\Global\Downloads\LA30AA(US).pdf");
            var nonSb = File.ReadAllText(System.IO.Path.GetDirectoryName(@"C:\Users\Global\Downloads\LA30AA(US).pdf") + "\\output.txt");
            if (sb.Equals(nonSb))
                MessageBox.Show("They're the same");
        }
        public static void ReadPdfToOutputFile(string fileName)
        {

            string testFilePath = System.IO.Path.GetDirectoryName(fileName) + "\\output.txt";
            if (System.IO.File.Exists(fileName))
            {
                PdfReader pdfReader = new PdfReader(fileName);

                for (int page = 1; page <= pdfReader.NumberOfPages; page++)
                {
                    //We can change out the Type of extraction We use when getting Text from PDF
                    ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy(); //TopToBottomTextExtractionStrategy() or SimpleTextExtractionStrategy();
                    string currentText = PdfTextExtractor.GetTextFromPage(pdfReader, page, strategy);
                    currentText = Encoding.Default.GetString(Encoding.ASCII.GetBytes(currentText));
                    using (StreamWriter sr = File.AppendText(testFilePath))
                    {
                        sr.Write(currentText);
                    }

                }
                pdfReader.Close();
            }
        }
        public static String SBReadPdfToOutputFile(string fileName)
        {

            string testFilePath = System.IO.Path.GetDirectoryName(fileName) + "\\SBoutput.txt";
            if (System.IO.File.Exists(fileName))
            {
                PdfReader pdfReader = new PdfReader(fileName);

                StringBuilder sb = new StringBuilder();
                for (int page = 1; page <= pdfReader.NumberOfPages; page++)
                {
                    //We can change out the Type of extraction We use when getting Text from PDF
                    ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy(); //TopToBottomTextExtractionStrategy() or SimpleTextExtractionStrategy();
                    var text = PdfTextExtractor.GetTextFromPage(pdfReader, page, strategy);
                    sb.Append(Encoding.Default.GetString(Encoding.ASCII.GetBytes(text)));
                }
                pdfReader.Close();
                return sb.ToString();
            }
            return null;
        }