public void XoaMA(string maMA)
{
Data.Delete("CTHD", "MaHD =" + this.maHD + " and MaMA = " + maMA);
Data.Update("HoaDon", "TongTien =" + tongTien, "MaHD =" + this.maHD);
MonAn ma = cthd.Find(x => x.GetMa().Equals(maMA));
tongTien -= (ma.GetDonGia() * ma.GetSL());
cthd.Remove(ma);
}
public void ThemMA(string maMA, int soLuong)
{
MonAn i = cthd.Find(x => x.GetMa().Equals(maMA));
if (i != null)
{
i.TangSL(soLuong);
tongTien += (i.GetDonGia() * soLuong);
Data.Update("CTHD", "SoLuong =" + i.GetSL() + ", ThanhTien =" + i.GetThanhTien(), "MaHD = " + maHD + " and MaMA =" + maMA);
Data.Update("HoaDon", "TongTien =" + tongTien, "MaHD =" + this.maHD);
return;
}
else
{
this.cthd.Add(new MonAn(maMA, soLuong));
MonAn ma = cthd[cthd.Count() - 1];
double thanhtien = ma.GetDonGia() * soLuong;
tongTien += thanhtien;
Data.Add("CTHD", "MaHD, MaMA, TenMA, SoLuong, DonGia, ThanhTien", "'" + maHD + "','" + maMA + "','" + ma.GetTen() + "','" + soLuong + "','" + ma.GetDonGia() + "','" + thanhtien + "'");
Data.Update("HoaDon", "TongTien =" + tongTien, "MaHD =" + this.maHD);
}
}