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

https://msdn.microsoft.com/library/bb908822(v=vs.90).aspx

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

//this is just an example list. actual list does contain 700 records
words.Add("Apple");
words.Add("Moron");
words.Add("Seafood");
words.Add("Cars");
words.Add("Chicken");
words.Add("Twat");
words.Add("Watch");
words.Add("Android");
words.Add("c-sharp");
words.Add("Fool");

badWords.Add("Idiot");
badWords.Add("Retarded");
badWords.Add("Twat");
badWords.Add("Fool");
badWords.Add("Moron");

var result = words.Except(badWords).ToList();

Edit: Got in late.