public void LoadThamSo()
        {
            //ThamSoBUS tsBUS = new ThamSoBUS();
            THAMSO thamso = ThamSoBUS.LoadThamSo();

            txtTuoiToiThieu.Text         = thamso.TuoiToiThieu.ToString();
            txtTuoiToiDa.Text            = thamso.TuoiToiDa.ToString();
            txtThoiHanGiaTriThe.Text     = thamso.ThoiHanGiaTriThe.ToString();
            txtKhoangCachNamXuatBan.Text = thamso.KhoangCachNamXuatBanToiDa.ToString();
            txtSoLuongSachMuon.Text      = thamso.SoLuongSachMuonToiDa.ToString();
            txtSoNgayMuon.Text           = thamso.SoNgayMuonToiDa.ToString();
            txtTienPhat.Text             = thamso.TienPhat.ToString();
        }