MyNotePad

string ReadPdfFile(string filename)
{
  var pdfText = new StringBuilder();
  var reader = new PdfReader(filename);
  var pages = reader.NumberOfPages;
  for (int page = 1; page <= pages; page++)
  {
    var tes = new SimpleTextExtractionStrategy();
    var pgText = PdfTextExtractor.GetTextFromPage(reader, page, tes);
    pdfText.Append(pgText);
  }
  reader.Close();
  return pdfText.ToString();
}