private void button_stop_Click(object sender, EventArgs e)
 {
     WorkerFetcher.CancelAsync();
 }
 private void button_import_Click(object sender, EventArgs e)
 {
     textBox_projectImportMessages.Text = string.Empty;
     _senderButton = (Button)sender;
     WorkerFetcher.RunWorkerAsync();
 }
 private void button_validate_Click(object sender, EventArgs e)
 {
     textBox_timeregistrationImportMessages.Text = string.Empty;
     _senderButton = (Button)sender;
     WorkerFetcher.RunWorkerAsync();
 }