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 ...Get ASP.NET in a Nutshell now with the O’Reilly learning platform.
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