Asp.Net State management

Asp.net State Management

 

 

 

 

State Object

 

ViewState

                              

What : Encrypted String stored inhidden field

Where : hidden field in page

How long : page life cycle

Scope : current page

Performance Implication : too muchViewState will increase page Size and slow down page loading

Usage :Page Specific Settings

Limitation :

·      When store security data

·      Used by multiple pages

·      A lot of data need to store

Disable Scenario :

·      Control Never change after first time loading

·      Each post back rebind data

·      Input changes only because of user action (submitform )

(Page Never reach the 2^ndtime page render event )

 

Disable Level :

·      Control

·      Page

·      Web Config -> All Pages

Encryption / Hash :

·      ViewState Hash : EnableViewStateMac=”true”

1.       Pagelevel

2.       WebConfig level

 

·      ViewState Encrypt / Decrypt

1.       Pagelevel

2.       WebConfig  level

Session

What :

some user specific data stored in Server Memory / Sql Server/ State Server

Where :

Worker Process / Sql Server / State Server

How long :

Depends on the settings set in Web Config / Session tag ,default is 20mins

Scope :

Whole Application

Performance implication :

Store amount of information may slow down server / net work

Usage :

Store user specific data

Mode :

·      In Proc

1.      Store in Application Process

2.      Cannot use Web Garden Deploy strategy

3.      Default setting

·      Sql Server

1.      Store in data table

2.      More secure

3.      Can use inWebGarden Scenario

·      State Server

1.      Ensure Asp.Net Service is on

2.      Store in Asp.net Service and retrieve via TCP/IPprotocol

3.      Can use inWebGarden Scenario

 

·      Custom

1.      Always suggest to use a 3^rd party oneother than create own

SessionID Store Method :

·      Cookie (Default)

·      URL

When lost Session :

·      Close Browser

·      Session.Abandon

·      20 minutes time up

When Compression :

·      Large data storage

·      Web Garden Deploy strategy

Other Tips :

·      When Expired ,create a new Session Id :

RegeneratedExpiredSession=true

·      Force use SSL :

Request.Cookies[“ASP.NET_SessionID”].secure = true

 

Cookie

 

What  : key/value datastored in client browser

Where : client browser

How long :  depends onthe programmer by setting expired time

Scope : whole application

Performance implication : no .

Usage : Preference of user

 

Application

 

What : Object stored in server memory

How long : Application life time, until IIS reboot

Scope : Whole application

Performance implication : not suggest store too much data inapplication level

Usage : Store some application level object

Tips :

Each application object operation , remember :

·      Application lock

·      Application unlock

When consider using application object , better consider :

·      http module

·      Global asax file

 

Profile

What : store some setting in back end db

Where : a back end data base

How long :permanent

Scope :available for multiple applications

Performance implication : high concurrent may slow down dueto R/W to file

Usage :store some customer account information

 

Cache

What :  Page object cache

Where : server memory

How long :can set duration

Scope : whole application

Performance implication : depends

Usage :

Cache page data reduce page press

cache data reduce db trip

Transforming data between pages

 

QueryString

 

·      Limited length

·      Visible to user

·      Security reason : can user URL encode/decode

·      Usage : pass ID /name (Less data)

Form

·      Data not visible

·      Data unlimited

·      Usage : submit a form

 

CrossPagePostBack

·      Set post back URL

·      Check  PreviousePage.IsCrossPagePostBack : Identify arequest is from another page or not

·      Access Previous Page for data needed (from previouspage )

·      Validation : PreviousPage.IsValid

Server.Transfer

·      Ask Previous Page for data

·      No client request trip

·      Remain URL in browser

·      Can Remain Query string / Form