private void delete_btn__Click(object sender, RoutedEventArgs e)
        {
            MessageBoxResult result = MessageBox.Show("Are you sure you want to delete?", "BBTG", MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);

            if (result == MessageBoxResult.Yes)
            {
                try
                {
                    int EmployeeId = int.Parse(emp_id_txtbx.Text);

                    _lecturerViewModel.DeleteLecturerData(EmployeeId);
                    lecturer_data_grid.ItemsSource = _lecturerViewModel.LoadLecturerData();
                    ClearAll();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }