public void Delete(int ID)
        {
            QLPhongTroDBContext db = new QLPhongTroDBContext();
            TVNguoiDung         t  = db.TVNguoiDungs.SingleOrDefault(x => x.idUser == ID);

            db.TVNguoiDungs.Remove(t);
            db.SaveChanges();


            //QLPhongTroDBContext db = new QLPhongTroDBContext();
            //TVNguoiDung t = db.TVNguoiDungs.SingleOrDefault(x => x.idUser == ID);
            //t.SoDT = "34234234";
            //db.SaveChanges();
        }
        public void InsertDB(string tenUser, string gioiTinh, string email, int soDienThoai, string diaChi, string tenTaiKhoan)
        {
            QLPhongTroDBContext db          = new QLPhongTroDBContext();
            TVNguoiDung         tvNguoiDung = new TVNguoiDung();

            tvNguoiDung.TenUser     = tenUser;
            tvNguoiDung.GioiTinh    = gioiTinh;
            tvNguoiDung.Email       = email;
            tvNguoiDung.SoDT        = soDienThoai;
            tvNguoiDung.DiaChi      = diaChi;
            tvNguoiDung.idUser      = 1;
            tvNguoiDung.TenTaiKhoan = tenTaiKhoan;
            db.TVNguoiDungs.Add(tvNguoiDung);
            db.SaveChanges();
        }