Compare the difference between two list

Question

I\'am trying to check the difference between two List in c#.

Example:

List FirstList = new List         


        

Answer 1

You can use Enumerable.Intersect:

var inBoth = FirstList.Intersect(SecondList);

or to detect strings which are only in one of both lists, Enumerable.Except:

var inFirstOnly = FirstList.Except(SecondList);
var inSecondOnly = SecondList.Except(FirstList);

To get your ThirdList:

List ThirdList = inSecondOnly.ToList();