June 2002
Intermediate to advanced
816 pages
28h 12m
English
Content preview from ASP.NET in a NutshellBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Name
ViewState
Synopsis
StateBag = Page.ViewState
The ViewState property returns an instance
of the StateBag
class containing state information for
server controls on the page. This StateBag instance can also be used
to store arbitrary data that needs to be preserved across multiple
requests for the same page.
Parameters
-
StateBag An object of type StateBag that contains the property values for server controls on the page. This StateBag instance can also be used to store arbitrary data that needs to be preserved across multiple requests for the same page.
Example
The following code example sets the ForeColor property of the Message
control, and then stores the value of that color in the ViewState
StateBag instance. If the page is posted back, the code retrieves the
color that was stored, and depending on the name of the color,
changes the color from Red to
Black, or vice-versa.
<%@ Page Language="vb" %> <html> <head> <title>ViewState property example</title> <script runat="server"> Sub Page_Load( ) Dim LocalColor As System.Drawing.Color If IsPostBack Then LocalColor = CType(ViewState("LabelColor"), _ System.Drawing.Color) If LocalColor.Name = "Black" Then LocalColor = System.Drawing.Color.Red Else LocalColor = System.Drawing.Color.Black End If Message.ForeColor = LocalColor Message.Text = "Label color is " & LocalColor.Name ViewState("LabelColor") = LocalColor Else Message.ForeColor = System.Drawing.Color.Black LocalColor = Message.ForeColor Message.Text = "Label color is " & LocalColor.Name ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.