void addCategory() { string nameCategory = txtNameCategory.Text; int idProductCategory = Convert.ToInt32(dgvListCategory.SelectedCells[0].OwningRow.Cells["ID"].Value.ToString()); ProductCategory temp = _serviceProdutCategory.GetCategoryById_S(idProductCategory); if (temp != null) { if (temp.name == nameCategory) { return; } } if (_serviceProdutCategory.AddProductCategory_S(new ProductCategory() { name = nameCategory })) { MessageBox.Show("Thêm thành công!!!"); } loadListCategory(); }