ASP.NET: Viewstate in ASP.NET

It doesn't matter how many times you can click..: It wont increment beyond 1

We are going to click Control +F5 to run the application..

Any browser only understand HTML..It wont understand C#, Java, php.

Here you can see on this view code that clickcount will always be 0..It doesn't mater how many times you click

The reason why it doesnt t increment is the stateless nature of this protocol.

Web Form only live for a moment
It's a GetRequest, it's not PostBack..

The application needs to generates HTML that the browser can understand..
After the HTML is send back to the client , the web form that was created is immediately destroy..

#1 doesn't know anything about web form #2

Every timewe click we are posting back to the web server
Web form is initialized to 0.It's a postback so the code wont be executed
Look at the example:

It immediately destroy the Web Form again.
The web server doesn't remember the state between request..

Now look at this different scenario...

Click is te variable , you can name it anything you want..

In the line ClickCount= (int)Viewstate["Click"] + 1
There we are retrieving the value of Click, converting to an integer and we are adding 1 to that

At the end we are putting back that value at the ViewState of Clicks

So we create a webform2

1.-Page Load is executed 2.-It's not a post back so it wont execute that code

Look what happens when you click for the first time

Post back goes to the web server

Its not a post back so it wont execute that code
in #1 is null because we haven't store anything on that "Clicks"
so, line # 2 wont be executed
In line # 3 we are converting clickscount to a string ..in this case clickscount count is 1
In Line #4 we are converting Clickcount to a Viewstate variable

Them it sends the html back to the web server and destroy that web form immediately but remember it store that ClicksCount and convert it into a Viewstate variable

The value of the TextBox is stored in the viewstate of "Clicks" so that get send back to the web server.
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Now if we click the button for the second time ,
we check that format.....in line #1 Viewstate ("Clicks') =null ? Yes, because previously we convert the Clickcount into a variable in line #4

So in line # 2 it replace the value of "Clicks" and renew it with a Clicks variable, and it was 1 in previous request, converting that to and integer and increasing it by 1.
In line #4 it will store it in ViewState variable again..

So the next time you do it , the process repeats over and over every time we click.....

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Now look at this:

Here we are getting the value from the text box , converting it to an integer and adding 1 to it..And storing it back at the textbox property of textbox 1

In Web Form 3 there is not ViewState.
That happens because in asp.net they use by default Viewstate to preserve the data across postback

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