public float getSoDuConLaiLoaiTien(LoaiTien loaiTien) { float result = 0; LoaiTienManagement loaiTienManagement = new LoaiTienManagement(); DonHangManagement donHangManagement = new DonHangManagement(); result = loaiTien.HanMuc.Value - donHangManagement.tongGiaTriGiaoDich(" where IDLoaiTien=" + loaiTien.ID + " and TrangThai=N'DaChuyenCoin'"); return(result); }