To execute set-based operations on sequences, use LINQ's Intersect and Except operators.   The elements that are present in both input sequences are returned by the intersect operator. It returns the elements that are similar between two sequences after comparing each element to the other. Here is an illustration of how to use the intersect operator to identify the components that are shared by two lists of integers:  List list1 = new List { 1, 2, 3, 4 };
List list2 = new List { 3, 4, 5, 6 };
var commonElements = list1.Intersect(list2);  In this illustration, the operator intersect the contents of lists one and two and provides a new sequence with the shared elements three and four.   The items that are present in the first input sequence but absent from the second are returned by the Except operator. The elements that don't appear in the second sequence are returned after comparing each element of the first sequence to the second. Here is an illustration of how to identify the components that are in one list but not the other using the unless operator:  List list1 = new List { 1, 2, 3, 4 };
List list2 = new List { 3, 4, 5, 6 };
var exceptElements = list1.Except(list2);  In this case, the list1 and list2 elements are compared by the except operator, which gives a new sequence that contains the elements 1 and 2, which are present in list1 but absent from list2.   These operators can be applied to a variety of collections, including lists, arrays, etc. Finding the common or uncommon items between two sets of data using either of these operators is useful.   In conclusion, LINQ's Intersect operator compares each element of one sequence to the other and returns the items that are shared by both input sequences. The items that are present in the first input sequence but absent from the second are returned by the Except operator. The elements that don't appear in the second sequence are returned after comparing each element of the first sequence to the second. Finding the common or uncommon items between two sets of data using either of these operators is useful.