ASP.NET STATE MANAGEMENT

Session-VIII

In this session we will learn about

ASP.NET state management overview

Client –side state managementServer-side state management

state management overview

HTTP ( Hyper Text Transfer Protocol) is a stateless

protocol. When the client disconnects from the server,

the ASP. Net engine discards the page objects. This way

each web application can scale up to serve numerous

requests simultaneously without running out of server

memory.

However, there need to be some technique to store the

information between requests and to retrieve it when

required. This information i.e., the current value of all

the controls and variables for the current user in the

current session is called the State.

ASP.NET State Management

In a Web programming, this would typically mean

that all information associated with the page and the

controls on the page would be lost with each round

trip. To overcome this inherent limitation of

traditional Web programming,

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ASP.NET includes several options that help you

preserve data on both a per-page basis and an

application-wide basis.

We can secure data at both side: Serer side and

Client side using

Client Side State Management

Server side State Management

Storing page information using client-side

options doesn't use server resources.

These options typically have minimal security

but fast server performance because the demand on

server resources is modest.

Client-Based State Management

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The following are the client-side state management options that ASP.NET supports:

View state Hidden fields Cookies Query strings

View State

View State

The View State property provides a dictionary object

for retaining values between multiple requests for

the same page.

This is the default method that the page uses to

preserve page and control property values between

round trips.

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When the page is processed, the current state of the

page and controls is hashed into a string and saved in

the page as a hidden field.

When the page is posted back to the server, the page

parses the view-state string at page initialization and

restores property information in the page.

Hidden Fields

Hidden Fields

ASP.NET allows you to store information in a Hidden

Field control, which renders as a standard HTML

hidden field.

When a page is submitted to the server, the content

of a hidden field is sent in the HTTP form collection

along with the values of other controls.

Query Strings

Query Strings

A query string is information that is appended to the

end of a page URL. In order for query string values to

be available during page processing, you must

submit the page using an HTTP GET command.

Cookies

Cookies

A cookie is a small amount of data that is

stored either in a text file on the client file system or

in-memory in the client browser session.

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It contains site-specific information that the server

sends to the client along with page output.

Cookies can be temporary (with specific expiration

times and dates) or persistent.

Advantages of using Client-Side state management

No server resources are required  Simple implementation   Enhanced security features   Reliability   Data persistence

 

Disadvantages of using cookies are:

Performance considerations   

Size limitations:  Most browsers place a 4096-byte

limit on the size of a cookie, although support for

8192-byte cookies is becoming more common in

newer browser and client-device versions.

User-configured refusal   

Potential security risks