C# list remove duplicate items

List<string> lstWhitDuplicate = new list<string>();
lstWhitDuplicate.add("hallo");
lstWhitDuplicate.add("hallo");
lstWhitDuplicate.add("World");

List<string> lst = lstWhitDuplicate.Distinct().ToList(); 

// output lstWhitDuplicate:
// hallo hallo world
// output lst:
// hallo word

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