public ItemGioHang(int iMaSP, int sl)
{
using (QuanLiBanHang1Entities db = new QuanLiBanHang1Entities())
{
this.MaSP = iMaSP;
SanPham sp = db.SanPhams.Single(n => n.MaSP == iMaSP);
this.TenSP = sp.TenSP;
this.HinhAnh = sp.HinhAnh;
this.DonGia = sp.DonGia.Value;
this.SoLuong = sl;
this.ThanhTien = DonGia * SoLuong;
}
}