void DeleteWorkerProgressChange(object sender, ProgressChangedEventArgs e)
{
int progress = 0;
if (!(e.ProgressPercentage > 100 || e.ProgressPercentage < 0))
progress = e.ProgressPercentage;
if (progress % 10 == 0)
StatusLabel.Text = "Deleting " + 10 * (progress / 10) + "%";
else
StatusLabel.Text += ".";
dataGridViewProgressBar.Value = progress;
}