public bool Delete(string str) { return(dal.Delete(str)); }
public void Delete(KhachHang monhoc) { mon.Delete(monhoc); }
public int Delete(KhachHang k) { return(kh.Delete(k)); }
public bool Delete(string str) { return(dal.Delete(str)); }
public void Delete(KhachHang monhoc) { mon.Delete(monhoc); }
public int Delete(KhachHang k) { return(kh.Delete(k)); }