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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var listA = new List<Content>(){
                    new Content{CultureCode = "en", Property1 = 1},
                    new Content{CultureCode = "en", Property1 = 2},
                    new Content{CultureCode = "en", Property1 = 3},
                    new Content{CultureCode = "en", Property1 = 4},
                    new Content{CultureCode = "en", Property1 = 5}
                
            };
            
            var listB = new List<Content>(){
                    new Content{CultureCode = "en-GB", Property1 = 2},
                    new Content{CultureCode = "en-GB", Property1 = 4},
                    new Content{CultureCode = "en-GB", Property1 = 6}
                
            };
            
            var result = (from a in listA
                          join b in listB on a.Property1 equals b.Property1 into g
                          from j in g.DefaultIfEmpty()
                          select new Content() { CultureCode = j == null ? a.CultureCode : j.CultureCode, Property1 = a.Property1 });
                
                //listA.Join(listB,
                //                    a => a.Property1,
                //                    b => b.Property1,
                //                    (a,b) => new Content() { CultureCode = b == null ? a.CultureCode : b.CultureCode, Property1 = a.Property1 });
            
            foreach(var item in result)
            {
                Console.WriteLine("{0} - {1}",item.CultureCode, item.Property1);
            }
        }
    }
    
    public class Content
    {
        public string CultureCode{get;set;}
        public int Property1 {get;set;}
    }
}

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Compilation time: 0.33 sec, absolute running time: 0.41 sec, cpu time: 0.28 sec, average memory usage: 16 Mb, average nr of threads: 4