int CompareByWeight(IFitting f1, IFitting f2)
{
if (f1.Weight < f2.Weight)
return 1;
if (f1.Weight > f2.Weight)
return -1;
return 0;
}
public bool Add(IFitting item)
{
Box b = item as Box;
if (b != null)
{
foreach (Box old in Boxes)
if (old.Id == b.Id)
return false;
Boxes.Add(b);
}
return true;
}
