FileStream filestream = new FileStream(@"D:cache.bin", FileMode.OpenOrCreate);
            try
            {
                BinaryFormatter binformat = new BinaryFormatter();
                _cacheFileList = (List<string>)binformat.Deserialize(filestream);
            }
            catch (SerializationException ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                filestream.Close();
            }