private void button3Delete_Click(object sender, EventArgs e)
 {
     if (listBox3Users.SelectedIndex > 0)
     {
         dataLayer.User user = (dataLayer.User)listBox3Users.SelectedItem;
         // no delete admin
         if (user.UserId == 1)
         {
             MessageBox.Show(this, "Cannot delete admin.", "Error");
         }
         else
         {
             if (user.Delete())
             {
                 MessageBox.Show(this, "User Deleted.", "Success");
                 PopulateUserPage();
             }
             else
             {
                 MessageBox.Show(this, "Cannot delete user.", "Error");
             }
         }
     }
 }