How to use C# to display Registry results on Rich Text Box?

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Hi There! I have a program which is able to retrieve various registry values using C# codes which was compiled and created using VS 2010.

However the problem arises when I tried to display the results retrieved from the Windows Registry into a rich text box within a form.

The form only shows 1 line which is the last value in the Array that contains the results.

Please do give some advice on the codes. Thanks!

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 Microsoft.Win32;

namespace Syscrawl
{
    public partial class FTK_Menu_Browsing_History : Form
    {
        public FTK_Menu_Browsing_History()
        {
            InitializeComponent();
        }

        private void buttonFileHistory_Click(object sender, EventArgs e)
        {
            this.Hide();
            FTK_Menu_File_History mfh = new FTK_Menu_File_History();
            mfh.ShowDialog();
            this.Close();
        }

        private void buttonEncryptedFiles_Click(object sender, EventArgs e)
        {
            this.Hide();
            FTK_Menu_Encrypted_Files mef = new FTK_Menu_Encrypted_Files();
            mef.ShowDialog();
            this.Close();
        }

        private void buttonRecentlyAccessedFiles_Click(object sender, EventArgs e)
        {
            this.Hide();
            FTK_Menu_Recently_Accessed_Files mraf = new FTK_Menu_Recently_Accessed_Files();
            mraf.ShowDialog();
            this.Close();
        }

        private void buttonRegistryHistory_Click(object sender, EventArgs e)
        {
            this.Hide();
            FTK_Menu_Registry_History mrh = new FTK_Menu_Registry_History();
            mrh.ShowDialog();
            this.Close();
        }

        private void buttonMainMenu_Click(object sender, EventArgs e)
        {
            this.Hide();
            Menu m = new Menu();
            m.ShowDialog();
            this.Close();
        }

        private void buttonLogOut_Click(object sender, EventArgs e)
        {
            this.Hide();
            Syscrawl_Login sl = new Syscrawl_Login();
            sl.ShowDialog();
            this.Close();
        }

        private void FTK_Menu_Browsing_History_Load(object sender, EventArgs e)
        {
            try
            {
                RegistryKey rk = Registry.CurrentUser;

                rk = rk.OpenSubKey("Software\\Microsoft\\Internet Explorer\\TypedURLs", false);
                PrintKeys(rk);
                rk.Close();
            }

            catch (Exception MyError)
            {
                richTextBoxBrowsing.Text="An error has occurred: " + MyError.Message;
            }
        }

        void PrintKeys(RegistryKey rk)
        {
            if (rk == null)
            {
                richTextBoxBrowsing.Text="Couldn't open the desired subkey.";
                return;
            }

            richTextBoxBrowsing.Text = "Subkeys of " + rk.Name;

            try
            {
                string[] valnames = rk.GetValueNames();
                int i = 0;

                foreach (string s in valnames)
                {
                    string val = (string)rk.GetValue(valnames[i++]);
                    richTextBoxBrowsing.Text="-----------------------------------------------";
                    richTextBoxBrowsing.Text=s + " contains " + val;
                }
            }

            catch (Exception MyError)
            {
                richTextBoxBrowsing.Text = "An errors has occurred: " + MyError.Message;
            }
        }

        private void richTextBoxBrowsing_TextChanged(object sender, EventArgs e)
        {

        }
    }
}

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