C# and hex

Hi currently I'm working on a project and I'm wondering if anyone can help me, I have been set a task of creating a editor which I have done yes its basic and yes its from a book but I would like to add one more thing to it but I'm stuffed and cannot seem to get it to work.

basically I would like the output to be in hex rather than plain text, is this possible?

the code is

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.Drawing.Printing;
using System.Collections;
using System.Windows.Forms;

namespace Simple_ed
{
    public partial class frmMain : Form
    {
        private string m_sfileName = "";
        public frmMain()
        {
            InitializeComponent();
        }

        private void clearFormText()
        {
            this.Text = "Simple Editor - [unnamed]";
        }

        private void mnuFileExit_Click(object sender, System.EventArgs e)
        {
            // exit the application but query user if the text in the box has changed
            if (rtfMain.Modified == true)
            {
                if (MessageBox.Show("Abandon all changes? - All data will be LOST", "Confirm exit",
                MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    Application.Exit();
                }
            }
            else
            {
                Application.Exit();
            }
        }

        private void mnuFileNew_Click(object sender, EventArgs e)
        {
            // create new document with a check to see if the document has been altered
            if (rtfMain.Modified == true)
            {
                if (MessageBox.Show("Create new document? - All unsaved work will be LOST?", "New Document",
                MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    rtfMain.Clear();
                    m_sfileName = ""; // clear the file name
                    clearFormText(); // and reset the form caption
                }
            }
            else
            {
                rtfMain.Clear();
                m_sfileName = ""; // clear the file name
                clearFormText(); // and reset the form caption
            }
        }

        private void setFormText(string sFile)
        {
            // create an instance of a FileInfo class and use
            // it to get the file's name without its path
            System.IO.FileInfo fInfo;
            fInfo = new System.IO.FileInfo(sFile);
            this.Text = "Simple Editor - [" + fInfo.Name + "]";
        }

        private void mnuFileOpen_Click(object sender, EventArgs e)
        {
            bool bDoOpen = true;
            // show an Open File dialog and open the file, but
            // check that the current text has not changed first
            if (rtfMain.Modified == true)
            {
                if (MessageBox.Show("Text has changed - really open another document?",
                "Confirm file open", MessageBoxButtons.YesNo,
                MessageBoxIcon.Question) == DialogResult.No)
                    bDoOpen = false;
            }
            if (bDoOpen == true)
            {
                // get a file to open and open it
                dlgOpen.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";
                dlgOpen.FilterIndex = 1;
                if (dlgOpen.ShowDialog() == DialogResult.OK && dlgOpen.FileName.Length > 0)
                {
                    rtfMain.LoadFile(dlgOpen.FileName, RichTextBoxStreamType.PlainText);
                    rtfMain.Modified = false;
                    m_sfileName = dlgOpen.FileName;
                    setFormText(m_sfileName);
                }
            }
        }

        private void mnuFileSave_Click(object sender, EventArgs e)
        {
            // save the file if we have a filename for it
            if (m_sfileName != "")
                rtfMain.SaveFile(m_sfileName, RichTextBoxStreamType.PlainText);
            else
                mnuFileSaveAs_Click(sender, e);
        }

        private void saveFileDialog1_FileOk(object sender, CancelEventArgs e)
        {

        }

        private void mnuFileSaveAs_Click(object sender, EventArgs e)
        {
            // if we have a filename, use that in the dialog, otherwise use
            // a generic name
            if (m_sfileName != "")
                dlgSave.FileName = m_sfileName;
            else
                dlgSave.FileName = "SimpleEd1";
            dlgSave.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";
            dlgSave.FilterIndex = 1;
            dlgSave.DefaultExt = "txt";
            if (dlgSave.ShowDialog() == DialogResult.OK && dlgSave.FileName.Length > 0)
            {
                rtfMain.SaveFile(dlgSave.FileName,
                RichTextBoxStreamType.PlainText);
                rtfMain.Modified = false;
                m_sfileName = dlgSave.FileName;
                setFormText(m_sfileName);
            }
        }
    }
}

In my simplistic approach I am guessing that it is something to do with this line

Code:

rtfMain.LoadFile(dlgOpen.FileName, RichTextBoxStreamType.PlainText);

but as I have found learning this language nothing is as simple as it seems.

its just a starting point for me to learn really and i will be expanding it as much as i can as i learn ATM I'm just learning how to do the cut copy and paste.

I thank anyone in advance for the help they may offer

Sorry I forgot to say I'm using Microsoft visual studio 2010 c# if that makes a difference.

One way you can do it is after you've called rtfMain.LoadFile(), convert the text in rtfMain to hex.

I found a function online that converts a string to hex:
C# - Convert ASCII String To Hex | testingReflections.com

Here's the function on that page if you can't see it for whatever reason:

Code:

public string ConvertToHex(string asciiString)
{
    string hex = "";
    foreach (char c in asciiString)
    {
        int tmp = c;
        hex += String.Format("{0:x2}", (uint)System.Convert.ToUInt32(tmp.ToString()));
    }
    return hex;
}

Incrementing strings together is a terrible idea in C#. They're just not made to work that way. Instead, you should use a StringBuilder.

Code:

public static string ConvertToHex(string asciiString)
{
    StringBuilder hex = new StringBuilder();

    foreach (char c in asciiString)
        hex.AppendFormat("{0:x2}", (uint)c);

    return hex.ToString();
}