PDFBox-2

1. Ref: http://naspinski.net/post/ParsingReading-a-PDF-file-with-C-and-AspNet-to-text.aspx
2. Add Ref
// PDFBox/bin:
//2-1 FontBox-0.1.0-dev.dll
//2-2 IKVM.GNU.Classpath.dll
//2-3 IKVM.Runtime.dll
//2-4 PDFBox-0.7.3.dll
// 3. using
using org.pdfbox.pdmodel;
using org.pdfbox.util;
// 4
using System.IO;
// 5 Add parsePDF method

public static void parsePDF(string pdf_in, string txt_out)
        {
            StreamWriter sw = new StreamWriter(txt_out, false);
            try
            {
                sw.WriteLine();
                sw.WriteLine(DateTime.Now.ToString());
                PDDocument doc = PDDocument.load(pdf_in);
                PDFTextStripper stripper = new PDFTextStripper();
                sw.Write(stripper.getText(doc));
            }
            catch (Exception ex) { Console.Write(ex.Message); }
            finally
            {
                sw.Close();
                sw.Dispose();
            }
        }
// 6. Console mode project

      static void Main(string[] args)
        {
            string pdf_in = @"E:\Working\PDF2Text\TryExe\101050_1401.PDF";
            string txt_out = "Test.txt";
            parsePDF(pdf_in, txt_out);
            Console.WriteLine("Done!");
        }