Question

You see it everywhere, drag and drop an item to a different row or the up and down arrow for moving an item up the list or down the list.

What’s a preferred algorithm or pattern for accomplishing this

Answer 1

Um, have it in an ordered list instead of sorting it?

Say you have a list of items:

List<string> l = new List<string>() {"one", "five", "two", "three", "four", "six"};

Want to move item 1 ("five") to index 5 (before "six")?

l.Insert(5, l[1]);
l.RemoveAt(1);

It’s not hard to adapt this to any kind of display.