how to open and decode pdf file into richtextbox

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Hello Friends,

I create a pdf reader using Itextsharp in C#.net windows application, and open successfully pdf file in the Richtextbox but this file open not in a actual file data these are open into other language like that compiler language or any other format.

Please solve my problem.

I have use this code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.Drawing.Text;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
namespace rifakpdfcreator
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public ArrayList RichTextBoxes;
        int d = 80;
        int i = 0;
        private void Form1_Load(object sender, EventArgs e)
        {

           // int c = 40;
            this.RichTextBoxes = new ArrayList();
            this.RichTextBoxes.Add(new RichTextBox());
            ((RichTextBox)this.RichTextBoxes[i]).Location = new System.Drawing.Point(120, d);
            ((RichTextBox)this.RichTextBoxes[i]).Name = "RichTextBoxName" + i.ToString();
            ((RichTextBox)this.RichTextBoxes[i]).Size = new System.Drawing.Size(1000,600);
            panel2.Controls.Add(((RichTextBox)this.RichTextBoxes[i]));
            ((RichTextBox)this.RichTextBoxes[i]).ScrollBars = System.Windows.Forms.RichTextBoxScrollBars.None;
            ((RichTextBox)this.RichTextBoxes[i]).TextChanged += new EventHandler(Form1_TextChanged);
            ((RichTextBox)this.RichTextBoxes[i]).ContextMenuStrip = contextMenuStrip1;
          
            
        }

        private void Form1_TextChanged(object sender, EventArgs e)
        {
            int c = 120;

            Point pos = new Point(0, 0);
            pos.X = ClientRectangle.Width;
            pos.Y = ClientRectangle.Height;
            RichTextBox aa = ((RichTextBox)this.RichTextBoxes[i]);
            int a = aa.GetCharIndexFromPosition(pos);
            int line = aa.GetLineFromCharIndex(a);


            if (line > 40)
            {
                i = i + 1;
                this.RichTextBoxes.Add(new RichTextBox());
                ((RichTextBox)this.RichTextBoxes[i]).Location = new System.Drawing.Point(c, d + 620);
                ((RichTextBox)this.RichTextBoxes[i]).Name = "RichTextBoxName" + i.ToString();
                ((RichTextBox)this.RichTextBoxes[i]).Size = new System.Drawing.Size(1000,600);
                panel2.Controls.Add(((RichTextBox)this.RichTextBoxes[i]));
                RichTextBox ab = ((RichTextBox)this.RichTextBoxes[i]);
                ((RichTextBox)this.RichTextBoxes[i]).Focus();
                ((RichTextBox)this.RichTextBoxes[i]).ScrollBars = System.Windows.Forms.RichTextBoxScrollBars.None;
                ((RichTextBox)this.RichTextBoxes[i]).TextChanged += new EventHandler(Form1_TextChanged);
            }
        }

        private void panel2_Paint(object sender, PaintEventArgs e)
        {

        }
              
        
        private void copyToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ((RichTextBox)this.RichTextBoxes[i]).Copy();
        }

        
        private void selectAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ((RichTextBox)this.RichTextBoxes[i]).SelectAll();
        }

        private void zoomInToolStripMenuItem_Click(object sender, EventArgs e)
        {
            float zoom = ((RichTextBox)this.RichTextBoxes[i]).ZoomFactor;
            if (zoom * 2 < 64)
                ((RichTextBox)this.RichTextBoxes[i]).ZoomFactor = zoom * 2;
            ((RichTextBox)this.RichTextBoxes[i]).Focus();
        }

        private void zoomOutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            float zoom = ((RichTextBox)this.RichTextBoxes[i]).ZoomFactor;
            if (zoom / 2 > 0.015625)
                ((RichTextBox)this.RichTextBoxes[i]).ZoomFactor = zoom / 2;
            ((RichTextBox)this.RichTextBoxes[i]).Focus();
        }

        private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            DialogResult drs = openFileDialog1.ShowDialog();
            openFileDialog1.Filter = "Pdf File|*.pdf";
            openFileDialog1.Title = "Open pdf file";

            if (drs == DialogResult.OK)
            {
                string file = openFileDialog1.FileName;
                byte[] byt = File.ReadAllBytes(file);
                ((RichTextBox)this.RichTextBoxes[i]).Text = Convert.ToBase64String(byt);
                

            }
        }

        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            
            
            saveFileDialog1.DefaultExt = ".pdf";
            saveFileDialog1.Title = "Save";
            saveFileDialog1.Filter = "Pdf file|*.pdf";
            saveFileDialog1.FileName = "Name";
            saveFileDialog1.ShowDialog();
            string str = saveFileDialog1.FileName;
            Document myDocument = new Document(PageSize.A4.Rotate());
            PdfWriter.GetInstance(myDocument, new FileStream(str, FileMode.Create));
            myDocument.Open();
            string file = ((RichTextBox)this.RichTextBoxes[i]).Text;
            myDocument.Add(new Paragraph(file));
            myDocument.Close();
        }

out put is
i open a pdf file which text is abhishek tyagi
but the file open is text is (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)