LINQ join which returns differences

LINQJoin.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication4
{
  class A
  {
    public string Name { get; set; }
    // other fields in here that are different than B
  }

  class B
  {
    public string Name { get; set; }
    // other fields in here that are different than A
  }

  class Program
  {
    static void Main(string[] args)
    {
      // perhaps you could use the .Except() method but here is a join to find the
      // differences between A and B

      List<A> firstList = new List<A>()
      {
        new A() { Name="Frank Hale" },
        new A() { Name="John Smith" },
        new A() { Name="Steve Jones" },
      };

      List<B> secondList = new List<B>()
      {
        new B() { Name="Frank Hale" },
      };

      var query = from na in firstList
                  join nb in secondList
                    on na.Name equals nb.Name into joinedNames
                  from nb in joinedNames.DefaultIfEmpty()
                  where nb == null
                  select na;

      foreach(A a in query)
      {
        Console.WriteLine(a.Name);
      }
    }
  }
}