//public void suaCTPhieuNhapKho(string mapnk, string manl, string soluong, string thanhtien)
        //{
        //    CT_PHIEUNHAPKHO update = db.CT_PHIEUNHAPKHOs.Where(t => t.MANL == manl && t.MAPNK == mapnk).FirstOrDefault();
        //    if (update != null)
        //    {
        //        update.SOLUONG = Convert.ToInt32(soluong);
        //        update.THANHTIEN = Convert.ToInt32(thanhtien);
        //    }
        //    db.SubmitChanges();
        //}
        public void xoaCTPhieuNhapKho(string mapn, string manl)
        {
            CT_PHIEUNHAPKHO ct = db.CT_PHIEUNHAPKHOs.Where(t => t.MAPNK == mapn & t.MANL == manl).FirstOrDefault();

            db.CT_PHIEUNHAPKHOs.DeleteOnSubmit(ct);
            db.SubmitChanges();
        }
        public void themCTPhieuNhapKho(string mapnk, string manl, int soluong, int donGia)
        {
            CT_PHIEUNHAPKHO ct = new CT_PHIEUNHAPKHO();

            ct.MAPNK   = mapnk;
            ct.MANL    = manl;
            ct.SOLUONG = soluong;
            ct.GIANHAP = donGia;
            db.CT_PHIEUNHAPKHOs.InsertOnSubmit(ct);
            db.SubmitChanges();
        }