private void RefreshUserList()
        {
            user u = new user();

            foreach (DataRow aRow in u.GetAllData("username").Rows)
            {
                u = new user();
                u.Load(aRow);

                lstUsers.Items.Add(u);
            }

            if (lstUsers.Items.Count > 0)
            {
                lstUsers.SelectedIndex = 0;
            }
        }