private void btnLuu_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e) { // Thêm mới if (item == null) { item = new NhaCungCap { Ten = txtTen.Text, DiaChi = txtDiaChi.Text, DienThoai = txtDienThoai.Text, Fax = txtFax.Text }; nccBLL.Them(item); this.Close(); if (from != null) { (from as frmDanhSachNCC).CapNhat(); from.Focus(); } MessageBox.Show("Thêm thành công.", "Thông báo"); return; } item.Ten = txtTen.Text; nccBLL.Sua(item); (from as frmDanhSachNCC).CapNhat(); from.Focus(); MessageBox.Show("Sửa thành công.", "Thông báo"); }