public Renter Add(Renter item)
{
var newRenter = (Renter)item.Clone();
newRenter.Id = !_renters.Any() ? 1 : _renters.Max(renter => renter.Id) + 1;
_renters.Add(newRenter);
return (Renter)newRenter.Clone();
}
public Renter Update(Renter item)
{
var existRenter = _renters.SingleOrDefault(renter => renter.Id == item.Id);
if (existRenter == null)
{
throw new NullReferenceException();
}
existRenter.FirstName = item.FirstName;
return (Renter)existRenter.Clone();
}
