CODEWITHSUNDEEP
c#asp.net
user2090114
user2090114

Reputation: 89

When might you choose to use ViewState over the Session?

I have a doubt why we use ViewState because Session can keep its state throughout the application. Then why is the need for ViewState which can keep the state only in a single Page?

Upvotes: 2

Views: 1443

Answers (2)

Martin Parenteau
Martin Parenteau

Reputation: 73721

If the user opens several instances of the application in different tabs of the browser, the data stored in Session will be shared by all of them (unless something special is done to avoid that). One instance modifying a value in a Session variable will overwrite the same variable saved by the other instances, causing a mixup of the data. Using ViewState ensures that each instance is not affected by the others.

Upvotes: 2

KhawajaAtteeq
KhawajaAtteeq

Reputation: 401

First Thing first is to know what is

View State Is information of a particular page in webforms. It is stored in hidden field. It is used to maintain that the page remembers what he did on it the last time.

Session Is information that is related to a specific session.i.e. certain browser

now coming to your question

When to use and not use is a cluster F......

as all have their specific pros and cons specially ViewSate is more a con I guess since the MVC was introduced.
One can use viewstate to store values to remember when its page have a post back as every time, when a page is in a post back stage it removes all the values of user controls .i.e. like Label and TextBox in asp.net . So to keep the value you've toEnableViewState property to true Session on the other hand is used when you wish to move from page to page, to keep some specific value for all the pages. For example: one keeps UserId in session so he can visit all the page which need some kind ofauthorization or authentication

Update

As you've changed you question while I was type: In that case Sessions is for specific time whereas Viewstate does not as Viewstate is a temporary storage mechanism. Controls that use viewstate have their state rendered into the html page as hidden input.

Hope this will help you in any way, and don't worry about vote down you'll get use to of it

Upvotes: 3

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