how can u store the set of pdf files in collections

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C#

how can u store the set of pdf files in collections like array list,list

actually my probelm is set of pdf files path stored in filearray and also get the file

name,size,length from file array but file content not read properly thats why i want to

store set of pdf files on collection

my filearray code:

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

namespace test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
      public static string StringFromBytes(byte[] arr)
        {
            char[] ch = new char[arr.Length / 2];
            for (int i = 0; i < ch.Length; ++i)
            {
                ch[i] = (char)((int)arr[i * 2] + (((int)arr[i * 2 + 1]) << 8));
            }
            return new String(ch);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ArrayList fileStatistics = new ArrayList();
            String datasetPath = @"D:\Data Sets\Enron";
            DirectoryInfo d = new DirectoryInfo(datasetPath);
            FileInfo[] files = d.GetFiles("*.pdf");
            MessageBox.Show(files.Length.ToString());

            foreach (FileInfo file in files)
            {                
                    //create instance of data class
                    fileAtt f = new fileAtt();

                    f.fFullName = file.FullName;
                    f.fName = file.Name;
                    f.FileSize = file.Length;
                    f.fExtension = file.Extension;
                    byte[] bytes = File.ReadAllBytes(file.FullName);
                    f.content    =Form1.StringFromBytes(bytes);
                   //f.content = Encoding.ASCII.GetString(bytes);
                   f.lastaccesstime = file.LastAccessTime;                
                    fileStatistics.Add(f);
                 //   StreamReader r = new StreamReader(datasetPath);
                 //foreach
                    
                
            }
            gvStatistics.DataSource = fileStatistics;

        }
        }
    }

pls help me