Windows application loading loads of data.

private BackgroundWorker worker = new BackgroundWorker();
...
butDoMyTask.Enabled = false;
ShowProgress.Visible = true;
worker.DoWork += new DoWorkEventHandler(worker_DoWork);
worker.WorkerReportsProgress = true;
worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
worker.RunWorkerAsync();

void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
    butDoMyTask.Enabled = true;
    ShowProgress.Visible = false;
    }

void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
    ShowProgress.Value = e.ProgressPercentage;
    }

void worker_DoWork(object sender, DoWorkEventArgs e)
    {
    for (int i = 0; i <= 100; i += 10)
        {
        Thread.Sleep(1000);
        worker.ReportProgress(i);
        }
    }