Find if listA contains any elements not in listB

Question

I have two lists:

List listA     
List listB

How to check using LINQ if in the listA exists an element w

Answer 1

Get the difference of two lists using Any(). The Linq Any() function returns a boolean if a condition is met but you can use it to return the difference of two lists:

var difference = ListA.Where(a => !ListB.Any(b => b.ListItem == a.ListItem)).ToList();