static void FileMatch1(int count)
 {
     var comparer = new LambdaComparer<Item>((x,y)=>x.Name == y.Name);
     using (var traker = new TimeTick(string.Format("Test1 - Using Intersect ", count, count * 3)))
     {
         var items = LeftItems.Intersect(RightItems, comparer);
         traker.Stop(items.Count());
     }
 }
        static void FileMatch2(int count)
        {
            using (var traker = new TimeTick(string.Format("Test2 - Using LINQ Join", count, count * 3)))
            {
                var queryLeft = from l in LeftItems
                        join r in RightItems on l.Name equals r.Name into temp
                        from r in temp.DefaultIfEmpty()
                        select new Item { Name = l.Name, Match = !(r == null) };

                var cnt = queryLeft.Where(x => x.Match == true).Count();
                traker.Stop(cnt);
            }
        }