private void DeleteCustomerHearingAidOrder(DialogResult dialogResult) { if (dialogResult == DialogResult.Ok) { Task.Factory.StartNew(() => { CustomerAction.DeleteCustomerHearingAidOrders(this.DBConnectionString, this.Entity.CustomerHearingAidOrderCollection.Where(x => x.IsSelected)); RefreshCustomerHearingAidOrderCollection(); }); } else { this.ParentViewModel.ShowProgressBar = false; } }