public override void Put(object Key, object Value)
        {
            if (Get(Key) == null)
            {
                TimeStamp++;
                Data.Add(Key, new LRUCacheValueEntry(TimeStamp, Value));
                TimeStamps.Add(TimeStamp, Key);

                if (Data.Count > Capacity)
                {
                    SortedDictionary <long, object> .Enumerator enumTimeStamps = TimeStamps.GetEnumerator();
                    enumTimeStamps.MoveNext();
                    long key = enumTimeStamps.Current.Key;
                    Data.Remove(TimeStamps[key]);
                    TimeStamps.Remove(key);
                }
            }
        }