Client cache library / framework for fat clients

I wrote a generic class that encapsulates a static hash table using some put, get methods. But I thought it would be better if it has functions where I can determine some expiration time and some synchronization. All I have to do is cache some objects on the client. My application is a winform client and just need to cache some commonly used data items in memory.

I searched and found NCache, memcache, and other server-side cache products and frameworks. But is there anything simple for client-side caching in thick clients?

Thanks a lot, Mani