Control.EnableViewState Property (System.Web.UI)

EnableViewState Property

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

Control..::.EnableViewState Property

Updated: April 2009

Gets or sets a value indicating whether the server control persists its view state, and the view state of any child controls it contains, to the requesting client.

Namespace: System.Web.UI
Assembly: System.Web (in System.Web.dll)

Syntax

Visual Basic (Declaration)

<ThemeableAttribute(False)> _
Public Overridable Property EnableViewState As Boolean

Visual Basic (Usage)

Dim instance As Control
Dim value As Boolean

value = instance.EnableViewState

instance.EnableViewState = value

[ThemeableAttribute(false)]
public virtual bool EnableViewState { get; set; }

Visual C++

[ThemeableAttribute(false)]
public:
virtual property bool EnableViewState {
    bool get ();
    void set (bool value);
}

JScript

public function get EnableViewState () : boolean
public function set EnableViewState (value : boolean)

Property Value

Type: System..::.Boolean
true if the server control maintains its view state; otherwise false. The default is true.

Remarks

You must enable view state for the server control to maintain its state across HTTP requests.

A server control's view state is the accumulation of all its property values. In order to preserve these values across HTTP requests, ASP.NET uses an instance of the StateBag class to store the property values. The values are then passed as a variable to a hidden field when subsequent requests are processed. For more information about view state, see ASP.NET View State Overview.

There are times when it is appropriate to disable view state, particularly to improve application performance. For example, if you are loading a database request into a server control, set this property to false. If you do not, processor time will be wasted loading view state into the server control that will only be overridden by the database query. If EnableViewState is false, you can use the control state to persist property information that is specific to a control and cannot be turned off like the view state property. For more information on the difference between control state and view state, see Control State vs. View State Example.

For information about how to enable or disable view state declaratively for an ASP.NET page, see @ Page.

Examples

The following example sets the EnableViewState property to false.

Visual Basic

Sub Page_Load(sender As Object, e As System.EventArgs)
   DataBind()
   ' Set EnableViewState to false to disable saving of view state 
   ' information.
   myControl.EnableViewState = False
   If Not IsPostBack Then
      display.Enabled = False
   End If 
End Sub

void Page_Load(object sender, System.EventArgs e)
{
      DataBind();
      // Set EnableViewState to false to disable saving of view state 
      // information.
      myControl.EnableViewState = false;
      if (!IsPostBack)
         display.Enabled = false;

}

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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