DataCache.GetSystemRegionName Method (String)
Returns the system region name for the specified key. Not supported in Windows Azure Shared Caching.
Assembly: Microsoft.ApplicationServer.Caching.Client (in Microsoft.ApplicationServer.Caching.Client.dll)
Note that this method only retrieves the region name for items added to the default region. This happens when you add items to the cache without specifying a named region. There is no way to currently retrieve the named region associated with a given key.