protected void btnRemove_Click(object sender, EventArgs e)
{
MTCSYT.SYS_Session session = (MTCSYT.SYS_Session)Session["SYS_Session"];
string makhachang = lbMaKH.Text;
string matram = lbTram.Text;
List <Object> keyvalues = grdKH.GetSelectedFieldValues("THOIGIAN");
foreach (object key in keyvalues)
{
string thoigian = key + "";
db.DELETE_TTTT_KHACHHANG_LUUY_INFO(matram, makhachang, thoigian);
}
LoadKH();
grdKH.Selection.UnselectAll();
loadDanhMuc();
}