How can u get the matching percentage whenever compare the pdf files(compare the strings)

Question

Actually I want matching percentage whenever compare the pdf files.First I had completed 
read the pdf files content into string
my code like as
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
namespace WindowsFormsApplication1
public partial class Form1 : Form
string str1;
string filename;
string path;
string str2;
public Form1()
InitializeComponent();
private void button1_Click(object sender, EventArgs e)
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.CheckFileExists = true;
openFileDialog.AddExtension = true;
openFileDialog.Filter = "PDF files (*.pdf)|*.pdf";
DialogResult result = openFileDialog.ShowDialog();
if (result == DialogResult.OK)
filename = Path.GetFileName(openFileDialog.FileName);
path = Path.GetDirectoryName(openFileDialog.FileName);
textBox1.Text = path + "\\" + filename;
private void button2_Click(object sender, EventArgs e)
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.CheckFileExists = true;
openFileDialog.AddExtension = true;
openFileDialog.Filter = "PDF files (*.pdf)|*.pdf";
DialogResult result = openFileDialog.ShowDialog();
if (result == DialogResult.OK)
filename = Path.GetFileName(openFileDialog.FileName);
path = Path.GetDirectoryName(openFileDialog.FileName);
textBox2.Text = path + "\\" + filename;
public static string ExtractTextFromPdf(string filename)
using (PdfReader r = new PdfReader(filename))
StringBuilder text = new StringBuilder();
for (int i = 1; i <= r.NumberOfPages; i++)
text.Append(PdfTextExtractor.GetTextFromPage(r, i));
string result = text.ToString();
return result;
public static string Extract(string filename)
using (PdfReader r = new PdfReader(filename))
StringBuilder text = new StringBuilder();
for (int i = 1; i <= r.NumberOfPages; i++)
text.Append(PdfTextExtractor.GetTextFromPage(r, i));
string result1 = text.ToString();
return result1;
private void button3_Click(object sender, EventArgs e)
str1 = Form1.ExtractTextFromPdf(textBox1.Text);
str2 = Form1.Extract(textBox2.Text);
}Finally how can u get the matching percentage whenever compare the pdf files(compare the strings)please help me.thank u

Answer 1

Hi,
Based on your code, I see your code related to
iTextSharp Pdf.
iText is a third party library to create PDF originally written for java. iTextSharp is
the C# adaptation of that library.
Question regarding iText are better asked on the iText forum, rather than the Microsoft Forum:
http://itextpdf.com/support
Thanks for your understanding.
Best regards,
Kristin
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