Welcome to the Lounge

static void FilterList(List<Foo> list)
{
    for (int i = list.Count - 1; i >= 0; i--)
    {
        if (Remove(list[i]))
            list.RemoveAt(i);
    }
}

static void FilterQueue(List<Foo> list)
{
    var q = new Queue<Foo>(list);
    for (int N = q.Count; N > 0; N--)
    {
        if (Remove(q.Peek()))
        {
            q.Dequeue();
        }
        else
        {
            q.Enqueue(q.Dequeue());
        }
    }
    list.Clear();
    list.AddRange(q);
}