LINQ - Find all items in one list that aren't in another list

Question

I\'m stuck with a LINQ query (or any other efficient means of accomplishing the same thing). Can someone show me how I can select all the items in one list that are not pre

Answer 1

Try using .Except extension method (docs):

var result = list1.Except(list2);

will give you all items in list1 that are not in list2.