public void addOwner(int store, string username, Session session)
{
if (store < 0)
{
throw new ArgumentException("illegal store number");
}
if (username == null)
{
throw new ArgumentNullException("null username");
}
if (username.Length == 0)
{
throw new ArgumentException("illegal username");
}
db.addOwner(store, username, session);
}
