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Caching

When you store most frequently used

data on to the temporary storage andproviding to different clients request,

then it is called as caching.

The main advantage of caching is to

improve the performance of the webserver by reducing the processing time.

When you are expecting more no. of

requests .

ASP 3.0 supports, entire page cachingonly at client side.

ASP.Net supports 3 types of caching,

a. Output Caching (Entire page

Caching)

b. Fragment Caching (Portion of web

Page as Caching)

c. Data Caching (memory Variable

Caching)

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Output caching is also termed as

entire page caching.When you want to maintain multiple

buffers content towards a single web

page then we require varybyparam

option.

To achieve this output caching go tohtml view,

User defined controlWeb user control will provide

reusability of graphical interfaces and

coding.

It will compile dynamically along with

web page.

The extension of the file is .ascx

This is local to the application, so it

will not appear in the toolbox.

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Data cachingWhen you apply caching

on the memory variables, then it is

called as data caching. This can beclassified into three types.

1. Ordinary caching

2. File based dependency data caching

3. Time based dependency data

caching

In asp.net the alternative for

application memory is provided with

data caching.

This will overcome all the drawbacksof application memory variable like,

1. Data caching is a thread safe as

compared to application memory.

So the lock method will be applied

implicitly to the variable, which is used

for modification.

Application. Lock ()

Application. Unlock ()

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(Not required in case of caching)

2. Data caching supports expiry policyfor the data, which is not supported by

application memory variable.

System.web.caching (namespace)

Cache class

CacheDependency Class

Ordinary data caching

Cache. Insert (A, 100)Or

Cache (A) = 100

File based dependency data caching

When you want to provide expiry

policy of data, based on time stamp of

the file, then it is called as file based

dependency data caching.

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Time based dependency data caching

When you want to provide expirypolicy of data, based on time, then it is

called as time based dependency data

caching.

Time can be based on two types.

1. Absolute time will be consideredfrom storage time.

Ex:

Cache.Insert(A,100,Nothing,DateTime

.Now.addminutes(5),Cache.noslidingExp

iration)

2. Sliding time will be considered

from the last access.

Ex:

Cache.Insert(A,100,Nothing,

Cache.noAbsoluteExpiration.Timespan.F

romMinutes(5))

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When it comes to data caching, the

content will be erased, whenapplication demands for the memory.