public override void Add(IStaff child)
{
if (!children.Contains(child))
{
children.Add(child);
}
}
public override bool Remove(IStaff child)
{
if (!children.Contains(child))
{
children.Remove(child);
return(true);
}
else
{
return(false);
}
}
public override bool Remove(IStaff child)
{
throw new NotImplementedException();
}
public override void Add(IStaff child)
{
throw new NotImplementedException();
}
public abstract bool Remove(IStaff child);
public abstract void Add(IStaff child);
