Use of Except operator in Linq

How to calculate
subtraction (set operation) of ordered lists in C#?

E.g. after execution

of code:

List<int> a = new int[] { 1, 2, 5, 6, 7}.ToList();

List<int> b = new int[] { 1, 2, 3, 6}.ToList();

List<int> c = ListSubtract(a, b);

c should contains 5, 7.

It would be good to
perform in O(a.Count()+b.Count()) operations, but it is not critical.






Solution use of Except in Linq
Operator 
 





















List<int> c = a.Except(b).ToList();