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3. Designing the Data Access Layer > Objective 3.3: Design Data Caching
When data is expensive to retrieve, such as when you must access a database or call a web service method, and you might need to access the data again, you should cache the data to improve performance. Caching keeps a copy of data in memory, so that the next time your application needs it, it does not have to wait to retrieve it from disk or across the network.
Note: Working with Multiple Caches
The .NET Framework has three different, but similar, caches: the ASP.NET cache, the System.Runtime.Caching memory cache, and the AppFabric cache. If you might need to switch between them, you can use CacheAdapter, available at https://bitbucket.org/glav/cacheadapter.
