private void btn_DeleteGrand_Click(object sender, EventArgs e) { if (dGV_UsGroupUs.CurrentRow != null) { string username = dGV_UsGroupUs.CurrentRow.Cells[0].Value.ToString(); string idgroup = dGV_UsGroupUs.CurrentRow.Cells[1].Value.ToString(); bool flag = usr.DeleteUserOutGroup(username, idgroup); if (flag) { XtraMessageBox.Show("Xóa thành công !"); LoadUserGroup(Convert.ToInt32(idgroup)); } else { XtraMessageBox.Show("Xóa thất bại !"); } } }