how to copy plaintext from webpage using c#

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C#

Windows

application

browser

, +

i want to copy plain text from a webpage into txt file using c#
i have written following code but was not successful

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.IO;

namespace browser
{
    public partial class Form1 : Form
    {
        string url;
        public Form1()
        {
            InitializeComponent();
            url = "https://www.truecaller.com/in/09959320349";
            textBox.Text = url;
            browser.Navigate(url);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            browser.Refresh();
        }

        private void home_Click(object sender, EventArgs e)
        {
            browser.GoHome(); 
        }

        private void back_Click(object sender, EventArgs e)
        {
            if (browser.CanGoBack)
            {
                browser.GoBack();
            }
        }

        private void forward_Click(object sender, EventArgs e)
        {
            if (browser.CanGoForward)
            {
                browser.GoForward();
            }
        }

        private void stop_Click(object sender, EventArgs e)
        {
            browser.Stop();
        }

        private void go_Click(object sender, EventArgs e)
        {
            url = textBox.Text.Trim();
            browser.Navigate(url);

            
        }

        private void save_Click(object sender, EventArgs e)
        {

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                Stream receiveStream = response.GetResponseStream();
                StreamReader readStream = null;
                if (response.CharacterSet == null)
                    readStream = new StreamReader(receiveStream);
                else
                    readStream = new StreamReader(receiveStream, Encoding.GetEncoding(response.CharacterSet));
                string data = readStream.ReadToEnd();
                response.Close();
                readStream.Close();


                FileStream fs = new FileStream("E:\\html.txt",FileMode.Append,FileAccess.Write);
                StreamWriter sw = new StreamWriter(fs);
                sw.WriteLine(data);
                sw.Close();
                fs.Close();
            }

        }

       
    }
}