What is difference between MemoryCache vs ObjectCache in .net 4.0?

Question

What is difference between .NET framework 4.0 MemoryCache vs ObjectCache? Where to use which object?

Answer 1

From MSDN;

The ObjectCache type is the primary type for the in-memory object cache. The built-in MemoryCache class derives from the ObjectCache class. The MemoryCache class is the only concrete object cache implementation in the .NET Framework 4 that derives from the ObjectCache class.

public class MemoryCache : ObjectCache, 
    IEnumerable, IDisposable

MemoryCache inherits from ObjectCache.

You can get a reference to the default MemoryCache instance like this;

public static ObjectCache cache = MemoryCache.Default;