// GET: CTHDs
 public ActionResult Index(string mahd)
 {
     using (qlbanhangEntities db = new qlbanhangEntities())
     {
         List <KhachHang> khachhang = db.KhachHangs.ToList();
         List <HoaDon>    hoadon    = db.HoaDons.ToList();
         List <CTHD>      cthd      = db.CTHDs.ToList();
         List <SanPham>   sanpham   = db.SanPhams.ToList();
         var main = from h in hoadon
                    join k in khachhang on h.MaKH equals k.MaKH
                    where (h.MaHD == mahd)
                    select new ViewModel
         {
             hoadon    = h,
             khachhang = k
         };
         var sub = from c in cthd
                   join s in sanpham on c.MaSP equals s.MaSP
                   where (c.MaHD == mahd)
                   select new ViewModel
         {
             cthd      = c,
             sanpham   = s,
             Thanhtien = Convert.ToDouble(c.DongiaBan * c.Soluong)
         };
         ViewBag.Main = main;
         ViewBag.Sub  = sub;
         return(View());
     }
 }
 // GET: Menu
 public ActionResult Index()
 {
     using (qlbanhangEntities db = new qlbanhangEntities())
     {
         var       loaisp    = db.LoaiSPs.ToList();
         Hashtable tenloaisp = new Hashtable();
         foreach (var item in loaisp)
         {
             tenloaisp.Add(item.MaLoaiSP, item.TenLoaiSP);
         }
         ViewBag.TenLoaiSP = tenloaisp;
         return(PartialView("Index"));
     }
 }