Difference two list c#

var list1 = new List<int> { 1, 2, 3, 4, 5};
var list2 = new List<int> { 3, 4, 5, 6, 7 };

var list3 = list1.Except(list2); //list3 contains only 1, 2
var list4 = list2.Except(list1); //list4 contains only 6, 7
var resultList = list3.Concat(list4).ToList(); //resultList contains 1, 2, 6, 7

Source: stackoverflow.com

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