Saving web url as a .mht(mhtml) file.

I tried to figure this out when i first started programming in c# and quickly gave up after many searches.
Unfortuantly I not tried since to figure out a solution to this. I have worked in webrequest a bit and Base64string Conversion a great deal. I dont Know if this will help but here is a way to convert the entire page to base64string.

using System;
using System.Windows.Forms;
using System.Net;
using System.IO;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        private byte[] downloadedData;
        public Form1()
        {            
            InitializeComponent();            
        }
        private void DownloadPage(string url)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream stream = response.GetResponseStream();
            
            byte[] buffer = new byte[1024];
            
            int dataLength = (int)response.ContentLength;
            
            progressBar1.Maximum = dataLength;
            lbProgress.Text = "0/" + dataLength.ToString();
            
            Application.DoEvents();
            
            MemoryStream memStream = new MemoryStream();
            while (true)
            {
                
                int bytesRead = stream.Read(buffer, 0, buffer.Length);

                if (bytesRead == 0)
                {
                   
                    progressBar1.Value = progressBar1.Maximum;
                    lbProgress.Text = dataLength.ToString() + "/" + dataLength.ToString();

                    Application.DoEvents();
                    break;
                }
                else
                {
                    
                    memStream.Write(buffer, 0, bytesRead);
                                        
                    if (progressBar1.Value + bytesRead <= progressBar1.Maximum)
                    {
                        progressBar1.Value += bytesRead;
                        lbProgress.Text = progressBar1.Value.ToString() + "/" + dataLength.ToString();

                        progressBar1.Refresh();
                        Application.DoEvents();
                    }
                }
            }
            
            downloadedData = memStream.ToArray();
            
            stream.Close();
            memStream.Close();
            
        }

        private void SavePage(string path, byte[] Data)
        {
            StreamWriter sw = new StreamWriter(path);
            sw.Write(Convert.ToBase64String(Data));
            sw.Flush();
            sw.Close();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            DownloadPage(textBox1.Text);
            //DownloadPage("http://www.codeproject.com");
        }

        private void button2_Click(object sender, EventArgs e)
        {
            SaveFileDialog sfd = new SaveFileDialog();
            if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.Cancel)
                return;
            SavePage(sfd.FileName, downloadedData);
        }
    }
}