Page.EnableViewState Property
Gets or sets a value indicating whether the page maintains its view state, and the view state of any server controls it contains, when the current page request ends.
Assembly: System.Web (in System.Web.dll)
Property Value
Type: System.Booleantrue if the page maintains its view state; otherwise, false. The default is true.
For information about why you might want to disable view state, see Control.EnableViewState.
Even if EnableViewState is false, the page might contain a hidden view state field that is used by ASP.NET to detect a postback.
The following code example sets the EnableViewState property to false when the page is loaded. This disables view state for the Page object, meaning that neither view-state information for the page nor any controls contained by the page are saved.
Security Note
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This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview. |
Public Class WebPage Inherits System.Web.UI.Page Private myFormObj As MyForm Private label1 As Label Private label2 As Label Private textBoxObj As TextBox Private buttonObj As Button Public Sub New() AddHandler Page.Init, AddressOf Page_Init End Sub 'NewNew Private Sub Page_Load(sender As Object, e As System.EventArgs) ' Comment the following line to maintain page view state. Page.EnableViewState = false myFormObj.Method = "post" Controls.Add(myFormObj) textBoxObj.Text = "Welcome to .NET" label1.Text = "Enter a name" buttonObj.Text = "ClickMe" AddHandler buttonObj.Click, AddressOf Button_Click myFormObj.Controls.Add(label1) myFormObj.Controls.Add(textBoxObj) myFormObj.Controls.Add(buttonObj) myFormObj.Controls.Add(label2) End Sub 'Page_Load Private Sub Button_Click(sender As Object, e As EventArgs) Dim temp As [String] = "<br>Name is " + textBoxObj.Text + "<br>" temp += "Saved content of previous page is " + CType(ViewState("name"), String) label2.Text = temp End Sub 'Button_Click Protected Overrides Sub LoadViewState(viewState As Object) If Not (viewState Is Nothing) Then MyBase.LoadViewState(viewState) End If End Sub 'LoadViewState Protected Overrides Function SaveViewState() As Object ViewState("name") = textBoxObj.Text Return MyBase.SaveViewState() End Function 'SaveViewState Private Sub Page_Init(sender As Object, e As EventArgs) AddHandler Me.Load, AddressOf Me.Page_Load myFormObj = New MyForm() label1 = New Label() label2 = New Label() textBoxObj = New TextBox() buttonObj = New Button() End Sub 'Page_Init End Class 'WebPage
Available since 1.1
