How to disconnect UI and Data in WPF

Sometimes, we want to "freeze" current displayed collection, while the original collection keep being updates. How to do it? There are some ways to get such functionality. One is to use CollectionView DeferRefresh method and release (dispose) it after you finished. However, it can not provide us with full functionality, due to fact, that the lock applies on original collection, thus we wont update it until the lock will be released.