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  //Collection of SpListCollection
  var Lists = site.RootWeb.Lists;
  
              //Convert To Enumerable By Linq Query
                var Query = from    myLists in Lists.OfType<SPList>()
                            where myLists.Hidden == true
                            select myLists;

                foreach (var item in Query)
                {
                    Console.WriteLine(item.Title);
                }