比较两个ObservableCollection（s）以查看它们是否不同

I'm working on comparing two versions of a listview, for a settings form. I need to know if the user actually modified the list at all, in which case when they click "Save" I'll actually save. If they didn't change anything, when they click "Save" I won't be wasting memory/time re-saving something they didn't change.I'm working on comparing two versions of a list