private void button2_Click(object sender, EventArgs e)
{
Product product = new Product {
Id = Convert.ToInt32(dataGridView1.CurrentRow.Cells[0].Value),
Name = textBox6.Text,
UnitPrice = Convert.ToDecimal(textBox5.Text),
StockAmount = Convert.ToInt32(textBox4.Text)
};
_productDal.update(product);
ProductsLoad();
MessageBox.Show("Updated!");
}