UserControl.cs:
public UserControl1()
{
    InitializeComponent();
    backgroundWorker1.WorkerReportsProgress = true;
    backgroundWorker1.WorkerSupportsCancellation = true;

}

private void UserControl1_Load(object sender, EventArgs e)
{
    if (backgroundWorker1.IsBusy != true)
    {
        // Start the asynchronous operation.
        backgroundWorker1.RunWorkerAsync();
    }

}
public static string Data;
       
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    label1.Text = e.ProgressPercentage.ToString() ;
}
Form1 f1 = new Form1();
       
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    BackgroundWorker worker = sender as BackgroundWorker;

    for (int i = 1; i <= 10; i++)
    {
        if (label1.Text==Data)
        {
                worker.CancelAsync();
                  
        }
        else
        {
            // Perform a time consuming operation and report progress.
            System.Threading.Thread.Sleep(500);
            worker.ReportProgress(i * 10);
        }
    }
}
Form.cs
private void button1_Click(object sender, EventArgs e)
{
           
    UserControl1 uc1 = new UserControl1();
    UserControl1.Data = "80";
    this.Controls.Add(uc1);
}