Most efficient way to compare two lists and delete the same

Question

I want to compare two lists and get the valid words into a new list.

var words = new List();
var badWords = new List();

//this i         


        

Answer 1

Use EnumerableExcept function storing in System.Linq namespace

finalList = words.Except(badWords).ToList();

Most efficient way to save your time and also the fastest way to do it, because Except implementation uses Set, which is fast