Remove items from list that intersect on property using Linq

Question

I have 2 lists of different objects (foo & bar) that share the same property lets call it id.

public List          


        

Answer 1

var foo = foo.Where(f => !bar.Any(b => b.Id == f.Id)).ToList();

Just keep in mind that this is a O(n²) solution, it won't work very well for big lists.