Question

I have two objects:

ObjectA
{
   string code;
   string country;
}

ObjectB
{
   string code;
   string otherstuff;
}

And I have List<objectA> and List<ObjectB> and I need to find all objects in List<ObjectB> which contains objectA.Code.
But cannot manage to implement it on LINQ query.

Answer 1

It sounds like you are trying to find all instances of ObjectB which have a code value present in any of the List<ObjectA> values. If so try the following

List<ObjectA> listA = ...;
List<ObjectB> listB = ...;
var all = listB.Where(b => listA.Any(a => a.code == b.code));