Interview Questions May 1st, 2006




What is application object ?

Application object can used in situation where we want data to be
shared across users globally.

What's the difference between Cache object and application object ?

The main difference between the Cache and Application objects is that
the Cache objectprovides cache-specific features, such as dependencies
and expiration policies.

How can get access to cache object ?

The Cache object is defined in the System.Web.Caching namespace. You
can get a referenceto the Cache object by using the Cache property of
the HttpContext class in the System.Web namespace or by using the Cache
property of the Page object.

What are dependencies in cache and types of dependencies ?

When you add an item to the cache, you can define dependency
relationships that canforce that item to be removed from the cache
under specific activities ofdependencies.Example if the cache object is
dependent on file and when the file datachanges you want the cache
object to be update.Following are the supported dependency:-

File dependency :- Allows you to invalidate a specific cache item when
a diskbased file or files change.

Time-based expiration :- Allows you to invalidate a specific cache
itemdependingon predefined time.

Key dependency :-Allows you to invalidate a specific cache item
dependingwhen another cached item changes.


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