public static void InitDataBase()
        {
            BUS.SQLDataContext.CreateDataContext();

            BaoCao    = new BaoCao_BUS();
            Diem      = new Diem_BUS();
            GiaoVien  = new GiaoVien_BUS();
            HocKy     = new HocKy_BUS();
            HocSinh   = new HocSinh_BUS();
            Lop       = new Lop_BUS();
            MonHoc    = new MonHoc_BUS();
            NamHoc    = new NamHoc_BUS();
            User      = new User_BUS();
            CaiDatBus = new CaiDat_BUS();
            Data      = new Data_BUS();
            CaiDat    = CaiDatBus.LoadDuLieuCaiDat();

            IsLoaded = true;
        }