private void Load_DuLieu(object sender, EventArgs e)
{
dtgrview_phonginfo.DataSource = null;
string SQL = "Select * from ROOM";
dtgrview_phonginfo.DataSource = null;
dtgrview_phonginfo.DataSource = KETNOICSDL_ROOM.loaddulieu(SQL, "ROOM");
HienThi_DL();
}
