public void Bestel(Ober ober, string product)
{
if (ober == null || string.IsNullOrEmpty(product))
{
return; // preconditie
}
ober.BrengBestelling(this, product);
}
public void Bestel(Ober ober, string product)
{
if (ober == null || string.IsNullOrWhiteSpace(product))
{
return;
}
ober.BrengBestelling(this, product);
}