using System.Collections.Generic;
using System.ComponentModel;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApp1
public partial class Form1 : Form
private async void button1_Click(object sender, EventArgs e)
string url = textBox1.Text;
var request = WebRequest.Create(url);
var response = await request.GetResponseAsync();
using (var sr = new StreamReader(response.GetResponseStream()))
textBox2.Text = await sr.ReadToEndAsync();