What is the easiest way to foreach through a List removing unwanted objects?

Question

In my application, _collection is a List from which I need to remove all User objects which do not match the criteria.

However, the fol

Answer 1

You can always start at the top index and iterate downward towards 0:

for (int i = _collection.Count - 1; i >= 0; i--)
{
    User user = _collection[i];
    if (!user.IsApproved())
    {
        _collection.RemoveAt(i);
    }
}

Mehrdad's answer looks pretty darn elegant, though.