private void btnAdd_Click(object sender, EventArgs e)
        {
            AddProduct addProductDialog = new AddProduct();

            addProductDialog.ShowDialog();
            loadDgv();
        }
        // Actualiza un producto seleccionado
        private void btnUpdate_Click(object sender, EventArgs e)
        {
            Product    selected      = (Product)dgvProductList.CurrentRow.DataBoundItem;
            AddProduct UpdateProduct = new AddProduct(selected);

            UpdateProduct.ShowDialog();
            loadDgv();
        }