Interview Questions April 24th, 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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