How to stop background worker?

Question

I wanted to make a website checker and i got this part of code:

private void button1_Click(object sender, EventArgs e)
        {
            
            if (radioButton1.Checked)
            {
                try
                {
                    if (!checkURL("http://" + textBox1.Text))
                    {
                        MessageBox.Show("Error!");
                        return;
                    }
                }
                catch
                {
                    MessageBox.Show("Error");
                    return;
                }
            }
            else
            {
                try
                {
                    var ping = new Ping();
                    var aa = ping.Send(IPAddress.Parse(textBox2.Text));
                    if (aa.Status != IPStatus.Success)
                    {
                        MessageBox.Show("Error!");
                        return;
                    }
                }
                catch
                {
                    MessageBox.Show("Error");
                    return;
                }
            }
            time = DateTime.Now;
            for (var i = 0; i < Environment.ProcessorCount * 2; i++)
            {
                //var bw = new BackgroundWorker();
                bw = new BackgroundWorker();
                bw.DoWork += (s, a) => a1(radioButton2.Checked);
                bw.RunWorkerAsync();
            }

          //  var t = new Timer();
            t.Interval = 25;
            t.Tick += (s, a) =>
                {
                   
                    label2.Text = i.ToString();
                };
            t.Start();

          //  var t1 = new Timer();
            t1.Interval = 1000;
            t1.Tick += (s, a) =>
            {
               
                label6.Text = (i - i1).ToString(); 
                label8.Text = ((int)DateTime.Now.Subtract(time).TotalSeconds).ToString();
                i1 = i;
            };
            t1.Start();
        }

How can i stop background worker on button 2 click?

Answer 1

As per your code, the Button 2 method should have access to same bw (background worker) object/variable, that was created in button1 click.

Use CancelAsync() method to request cancellation.

Check the Link above for code sample.

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.NET Maniac -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Answer 2

create a cancel button and add CancelAsync() to cancel.. or you can add a method to cancel background worker, use loop or anything like when some operation reach to some limit, then call or execute this CancelAsync() method.

Answer 3

In your DoWork method, check for BackgroundWorker.CancellationPending true, set e.Cancel to true and exit the DoWork method.  Call BackgroundWorker.CancelAsync to set CancellationPending.