Page.EnableViewState Property
.NET Framework 2.0
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.
Namespace: System.Web.UI
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
'Declaration Public Overrides Property EnableViewState As Boolean 'Usage Dim instance As Page Dim value As Boolean value = instance.EnableViewState instance.EnableViewState = value
/** @property */ public boolean get_EnableViewState () /** @property */ public void set_EnableViewState (boolean value)
public override function get EnableViewState () : boolean public override function set EnableViewState (value : boolean)
Not applicable.
Property Value
true if the page maintains its view state; otherwise, false. The default is true.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: |
|---|
|
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 (Visual Studio). |
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 'New 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
public class WebPage extends Page
{
private MyForm myFormObj;
private Label label1;
private Label label2;
private TextBox textBoxObj;
private Button buttonObj;
public WebPage()
{
get_Page().add_Init(new System.EventHandler(Page_Init));
} //WebPage
private void Page_Load(Object sender, System.EventArgs e)
{
// Comment the following line to maintain page view state.
get_Page().set_EnableViewState(false);
myFormObj.set_Method("post");
get_Controls().Add(myFormObj);
textBoxObj.set_Text("Welcome to .NET");
label1.set_Text("Enter a name");
buttonObj.set_Text("ClickMe");
buttonObj.add_Click(new EventHandler(Button_Click));
myFormObj.get_Controls().Add(label1);
myFormObj.get_Controls().Add(textBoxObj);
myFormObj.get_Controls().Add(buttonObj);
myFormObj.get_Controls().Add(label2);
} //Page_Load
private void Button_Click(Object sender, EventArgs e)
{
String temp = "<br>Name is " + textBoxObj.get_Text() + "<br>";
temp += "Saved content of previous page is "
+ get_ViewState().get_Item("name");
label2.set_Text(temp);
} //Button_Click
protected void LoadViewState(Object viewState)
{
if (viewState != null) {
super.LoadViewState(viewState);
}
} //LoadViewState
protected Object SaveViewState()
{
get_ViewState().set_Item("name", textBoxObj.get_Text());
return super.SaveViewState();
} //SaveViewState
private void Page_Init(Object sender, EventArgs e)
{
this.add_Load(new System.EventHandler(this.Page_Load));
myFormObj = new MyForm();
label1 = new Label();
label2 = new Label();
textBoxObj = new TextBox();
buttonObj = new Button();
} //Page_Init
} //WebPage
Community Additions
ADD
Show:
Security Note: