private void save_btn_Click(object sender, RoutedEventArgs e)
        {
            Security.Entities.Application app = applications.ElementAt(application_combobox.SelectedIndex);
            app.IsActive       = isActive_combobox.SelectedIndex == 0 ? true : false;
            app.LastModifiedBy = user.User_ID;
            app.LastModifiedOn = DateTime.Now;

            if (ApplicationDAO.updateApplication(app))
            {
                MessageBox.Show("Application updated", "SUCCESS");
            }
            else
            {
            }
        }