private void themThucPham() { string tenthucpham = cbTen.Text; using (quanlithucungEntities1 qlthucpham = new quanlithucungEntities1()) { THUCPHAM tp = qlthucpham.THUCPHAMs.FirstOrDefault(p => p.Tenthucpham.ToLower() == tenthucpham.ToLower()); if (tp == null) { qlthucpham.insertCTTP(mapn, int.Parse(txtSoLuong.Text), double.Parse(txtGia.Text), tenthucpham, cbLoai.SelectedValue.ToString(), null, txtdonvi.Text); qlthucpham.SaveChanges(); MessageBox.Show("Thêm thành công!"); } else { tp.SOLUONG += int.Parse(txtSoLuong.Text); CTNhapThucPham tpm = new CTNhapThucPham(); tpm.MaPN = mapn; tpm.MaThucPham = tp.Mathucpham; tpm.TenThucPham = tp.Tenthucpham; tpm.MaLoai = cbLoai.SelectedValue.ToString(); tpm.Soluong = int.Parse(txtSoLuong.Text); tpm.GiaNhap = double.Parse(txtGia.Text); tpm.DonVi = txtdonvi.Text; qlthucpham.CTNhapThucPhams.Add(tpm); qlthucpham.SaveChanges(); MessageBox.Show("Thêm thành công!"); } } }