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 System.Net; 
using System.Threading; 
 
namespace shua 
{ 
    public partial class Form1 : Form 
    { 
        public Form1() 
        { 
            InitializeComponent(); 
        } 
 
        private void button1_Click(object sender, EventArgs e) 
        { 
            backgroundWorker1.RunWorkerAsync(textBox1.Text); 
        } 
 
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) 
        { 
            BackgroundWorker worker = (BackgroundWorker)sender; 
            string url = e.Argument.ToString(); 
            int num = int.Parse(textBox2.Text); 
            for (int i = 0; i < num; i++) 
            { 
                if (!worker.CancellationPending) 
                { 
                    WebRequest request = WebRequest.Create(url); 
                    WebResponse response = request.GetResponse(); 
                    response.Close(); 
                    
                    Thread.Sleep(100); 
                    worker.ReportProgress(i * 100/ num, i); 
                } 
            } 
        } 
 
        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e) 
        { 
            progressBar1.Value = e.ProgressPercentage; 
            label3.Text = e.UserState.ToString(); 
        } 
 
        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) 
        { 
            MessageBox.Show("ok"); 
        } 
    } 
}