ช่วยเพิ่มเติมให้หน่อยครับ ผมลองทำแล้วแต่ยังไม่ได้ ช่วยแนะนำให้แนวทางในการใช้งานหน่อยครับ

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Collections;
using System.IO;
using System.Xml;
using System.Text;
using System.Net;
using System.Diagnostics;
using System.Globalization;
using System.Windows.Forms;

namespace TBrowser
{
    public partial class TBrowser : Form
    {
        /*public static String favXml = "favorits.xml", linksXml = "links.xml";
        String settingsXml = "settings.xml", historyXml = "history.xml";
        List<String> urls = new List<String>();
        XmlDocument settings = new XmlDocument();
        String homePage;
        CultureInfo currentCulture;*/

        public TBrowser()
        {
            InitializeComponent();
            //currentCulture = CultureInfo.CurrentCulture;
        }

        /*private void setVisibility()
        {
            if (!File.Exists(settingsXml))
            {
                XmlElement r = settings.CreateElement("settings");
                settings.AppendChild(r);
                XmlElement el;

                el = settings.CreateElement("menuBar");
                el.SetAttribute("visible", "True");
                r.AppendChild(el);

                el = settings.CreateElement("adrBar");
                el.SetAttribute("visible", "True");
                r.AppendChild(el);

                el = settings.CreateElement("linkBar");
                el.SetAttribute("visible", "True");
                r.AppendChild(el);

                el = settings.CreateElement("favoritesPanel");
                el.SetAttribute("visible", "True");
                r.AppendChild(el);

                el = settings.CreateElement("SplashScreen");
                el.SetAttribute("checked", "True");
                r.AppendChild(el);

                el = settings.CreateElement("homepage");
                el.InnerText = "about:blank";
                r.AppendChild(el);

                el = settings.CreateElement("dropdown");
                el.InnerText = "15";
                r.AppendChild(el);
            }
        }*/

        private string[] UrlMemoryArray = new string[100];
       

        private string[] memory = new string[100];
        private int count = 0;
        private string m_strURL = "";

        /*private TBrowser getCurrentBrowser()
        {
            return (TBrowser)webbrowser.Controls[0];
        }*/

        private void Form1_Load(object sender, EventArgs e)
        {
            if (m_strURL == "")
            {
                webbrowser.Navigate("http://www.google.co.th");
                memory[count] = urlcombobox.Text;
            }
            else
            {
                webbrowser.Navigate(m_strURL);
            }
            UrlMemoryArray[count] = urlcombobox.Text; 

            //urlcombobox.SelectedItem = urlcombobox.Items[0];
            //setVisibility();
  
        }
        private void btnb_Click(object sender, EventArgs e)
        {
            if (count > 0)                         
            {
                count = count - 1;
                urlcombobox.Text = memory[count];
                webbrowser.Navigate(urlcombobox.Text);       
                btnf.Enabled = true;               

            }
        }

        private void btnf_Click(object sender, EventArgs e)
        {
            if (count < 100)                                
            {
                count = count + 1;
                urlcombobox.Text = memory[count];
                webbrowser.Navigate(urlcombobox.Text);       
                btnb.Enabled = true;                  

                count = count + 1;                          
                if (memory[count] == null)         
                {
                    btnf.Enabled = false;          
                }
                count = count - 1;                           
            }
        }

        private void btng_Click(object sender, EventArgs e)
        {
            webbrowser.Navigate(urlcombobox.Text);
        }

        private void btnre_Click(object sender, EventArgs e)
        {
            webbrowser.Refresh();
        }

        private void webbrowser_Navigating(object sender, WebBrowserNavigatingEventArgs e)
        {
            donelabel.Visible = false;      
            prog.Visible = true;     
            prog.Value = 0;          
            prog.Minimum = 0;        
            prog.Maximum = 100;      
            prog.Step = 10;          
            prog.PerformStep();
        }

        private void webbrowser_Navigated(object sender, WebBrowserNavigatedEventArgs e)
        {
            prog.Step = 80;                                 
            prog.PerformStep();
            urlcombobox.Text = webbrowser.Url.ToString();
            openinglabel.Text = "Openning: " + urlcombobox.Text;      
            openinglabel.Visible = true;
        }

        private void webbrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            prog.Step = 10;                                              
            prog.PerformStep();                                          
            prog.Visible = false;                                        
            openinglabel.Visible = false;                                       
            donelabel.Visible = true;                                           

            if (memory[count].ToString() != webbrowser.Url.ToString()) 
            {
                count = count + 1;
                memory[count] = urlcombobox.Text;                       
            }

            if (count > 0)                                                      
            {
                btnb.Enabled = true;                                      
            }
            else
            {
                btnb.Enabled = false;                                     
            }
        }

        private void urltext_Click(object sender, EventArgs e)
        {
            urlcombobox.SelectAll();
        }

        private void urltext_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                webbrowser.Navigate(urlcombobox.Text);
            }
        }

        private void btnhome_Click(object sender, EventArgs e)
        {
            webbrowser.GoHome();
        }

        private void btnsave_Click(object sender, EventArgs e)
        {
            webbrowser.ShowSaveAsDialog();
        }

        private void btnprint_Click(object sender, EventArgs e)
        {
            webbrowser.ShowPrintDialog();
        }

        private void btnpv_Click(object sender, EventArgs e)
        {
            webbrowser.ShowPrintPreviewDialog();
        }

        private void btnppt_Click(object sender, EventArgs e)
        {
            webbrowser.ShowPropertiesDialog();
        }

        private void webbrowser_NewWindow(object sender, CancelEventArgs e)
        {
            TBrowser frmIE = new TBrowser();
            frmIE.NavigateIE(((WebBrowser)sender).StatusText);
            frmIE.Show();
            e.Cancel = true;
        }

        private void NavigateIE(string url)
        {
            m_strURL = url;
        }

        /*private void showUrl()
        {
            if (File.Exists(historyXml))
            {
                XmlDocument myXml = new XmlDocument();
                myXml.Load(historyXml);
                int i = 0;
                int num = int.Parse(settings.DocumentElement.ChildNodes[6].InnerText.ToString());
                foreach (XmlElement el in myXml.DocumentElement.ChildNodes)
                {
                    if (num <= i++) break;
                    else urlcombobox.Items.Add(el.GetAttribute("url").ToString());

                }
            }
        }*/

        /*private void urlcombobox_DropDown(object sender, EventArgs e)
        {
            urlcombobox.Items.Clear();
            showUrl();
        }*/

        /*private void urlcombobox_SelectedIndexChanged(object sender, EventArgs e)
        {
            getCurrentBrowser().Navigate(urlcombobox.SelectedItem.ToString());
        }*/

        private void Navigate(string p)
        {
            throw new NotImplementedException();
        }

        private void urlcombobox_Click(object sender, EventArgs e)
        {
            urlcombobox.SelectAll();  
        }
    }
}