Sliding Expiration: With sliding expiration, ASP.NET waits for a set period of inactivity to dispose of a neglected cache item.
Ex:
Cache.Insert("MyItem",obj,null,DateTime.MaxValue, TimeSpan.FromMinutes(10)) --> The cached data will be removed only if it is not used within a ten-minute period.
Absolute Expiration: With absolute expiration, we set a specific date and time when the cached item will be removed.
Here’s an example that stores an item for exactly 60 minutes:
Cache.Insert("MyItem",obj,null,DateTime.Now.AddMinutes(60), TimeSpan.Zero)
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