c# - Find items from a list which exist in another list

Question

I have a List<PropA>

PropA  
{  
    int a;  
    int b;  
}

and another List<PropX>

PropX  
{  
    int a;  
    int b;  
}

Now i have to find items from List<PropX> which exist in List<PropA> matching b property using lambda or LINQ.

Answer 1

ListA.Where(a => ListX.Any(x => x.b == a.b))