public void AddItem(Decoration decoration)
{
if (AvailableCapacity < decoration.Size)
{
throw new NotEnoughCapacityException();
}
AvailableCapacity -= decoration.Size;
Items.Append(decoration);
}
public void RemoveItem(int decorationId)
{
Decoration decoration = Items.FirstOrDefault(i => i.Id == decorationId);
if (decoration != null)
{
Items.ToList().Remove(decoration);
AvailableCapacity += decoration.Size;
}
}