private void productComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
string productName = productComboBox.Text;
int countProducts = _salesManager.CountProduct(productName);
if (countProducts > 0)
{
aQuantityTextBox.Text = countProducts.ToString();
}
else
{
aQuantityTextBox.Text = 0.ToString();
}
sale.ProductId = Convert.ToInt32(productComboBox.SelectedValue.ToString());
//DataTable dataTble = _salesManager.ProductUnitPrice(sale.ProductId);
//foreach (DataRow dr in dataTble.Rows)
//{
// unitPrice = Convert.ToDouble(dr["UnitPrice"].ToString());
//}
}