I have the following code:var sessionsWithError = SessionsFilteredByDate    .Where(i => i.TrackerId > 0 && i.StatusId == 0)    .Select(i => i.SessionId);var sessionsWithErrorFixed = BusinessClient.Instance.Tracker    .GetAllTrackerAttempts()    .Select(i => i.SessionId);var sessionsWithErrorIntersection = sessionsWithError.Intersect(sessionsWithErrorFixed);var sessionsWithErrorsNotFixed = sessionsWithError.Except(sessionsWithErrorIntersection);Then I have to create a IEnumerable where I put all the SessionsFilteredByDate where the sessionID is included in sessionsWithErrorsNotFixed, but this operation, since I am using the Any operator, it's slow, apparently \$O(m*n)\$.How can I achieve this operation with a lower complexity?SessionsFilteredByDateAndErrors = SessionsFilteredByDate    .Where(i => sessionsWithErrorsNotFixed.Any(y => y == i.SessionId));
Optimization code for checking if a list contains any element ID of another list
c#;performance;.net;linq;asp.net