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I am using MemoryCache to store key/value pairs in my MVC .Net application. There are 2 main purposes I am using MemoryCache . One is to store sessions for user ids, and another is to store constants (this is just an example) The keys could theoretically be the same in both cases, so I want some way to separate these 2. I am thinking of 2 or 3 ways. Which way is superior? Or is there a better alternative? Each key in the cache will be prepended by a namespace. "user_session:1", "user_session:2" "constants:1", "constants:2" Using nested dictionaries as keys. There will be a key "user_sessions" whose value will be a Dictionary that maps ids to the session object. There will be a key "constants" whose value will be a Dictionary. Each "namespace" gets its own MemoryCache instance. The disadvantage with #2 is that when I want to get the value belonging to a user ID, I need to first get the dictionary, then get the value for a key in that dictionary. Which means I need to store the dictionary in memory. IE: Dictionary<string, string> userSessions = MemoryCache.Default["user_sessions"] object session = userSessions.get("1");

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