Index was outside the bounds of the array.

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C#

I have Develop the project in that i have error


"Index was outside the bounds of the array."


Actually this project work for pdf files(it's conatain content English language)but

whenever take the Pdf files.it's contain content in Arabic Language at the time raise

the error

raise the error at the following

page = PdfTextExtractor.GetTextFromPage(r, i, Strategy);

my code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.IO;
using System.Text;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace test
{
    public partial class Form1 : Form
    {
        string filename;
        string path;
        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)
            {
                //data1 = openFileDialog.FileNames.Select(x => new FileInfo(x)).ToArray();
                filename = Path.GetFileName(openFileDialog.FileName);
                path = Path.GetDirectoryName(openFileDialog.FileName);
                textBox1.Text = path + "\\" + filename;

            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
          string s=  Form1.ExtractTextFromPdf(textBox1.Text);
          string reverseValue = new string(s.Select((c, index) => new { c, index })
                                       .OrderByDescending(x => x.index)
                                       .Select(x => x.c)
                                       .ToArray());
          richTextBox1.Text = reverseValue;
        }



        public static string ExtractTextFromPdf(string filename)
        {
            using (PdfReader r = new PdfReader(filename))
            {
                StringBuilder text = new StringBuilder();
                ITextExtractionStrategy Strategy = new iTextSharp.text.pdf.parser.LocationTextExtractionStrategy();
                for (int i = 1; i <= r.NumberOfPages; i++)
                {
                    //string first;
                    string page = "";
                    page = PdfTextExtractor.GetTextFromPage(r, i, Strategy);
                    string[] lines = page.Split('\n');
                    foreach (string line in lines)
                    {
                        text.Append(line);
                    }                   
                }
                string first = text.ToString();
                return first;
             
                 
            }
        }

    }
}

please help me.

thank u.