private void OnBtnImportClicked(object sender, EventArgs e) { if (import != null && import.IsBusy) { import.CancelAsync(); btnImport.Sensitive = false; } else { progress.Fraction = .0; progress.Text = string.Empty; import.RunAsync(); btnImport.Label = LBL_ABORT; btnClose.Sensitive = false; fcDatabase.Sensitive = false; } }