Page.EnableViewStateMac Property (System.Web.UI)

EnableViewStateMac Property

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This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

Page..::.EnableViewStateMac Property

Gets or sets a value indicating whether ASP.NET should verify message authentication codes (MAC) in the page's view state when the page is posted back from the client.

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

Syntax

Visual Basic (Declaration)

<BrowsableAttribute(False)> _
Public Property EnableViewStateMac As Boolean

Visual Basic (Usage)

Dim instance As Page
Dim value As Boolean

value = instance.EnableViewStateMac

instance.EnableViewStateMac = value

[BrowsableAttribute(false)]
public bool EnableViewStateMac { get; set; }

Visual C++

[BrowsableAttribute(false)]
public:
property bool EnableViewStateMac {
    bool get ();
    void set (bool value);
}

JScript

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

ASP.NET

<asp:Page EnableViewStateMac="True|False" />

Property Value

Type: System..::.Boolean
true if the view state should be MAC checked and encoded; otherwise, false. The default is false.

Remarks

Set the EnableViewStateMac property to true when a high degree of data integrity is required between postbacks, or where there is a high risk of tampering.

In most circumstances, do not set this property in code. Set the EnableViewStateMac attribute to true using the @ Page directive in the .aspx file. When the page is requested, the dynamically generated class sets the property.

A view state MAC is an encoded version of the hidden variable that a page's view state is persisted to when sent to the browser. When you set the EnableViewStateMac attribute to true, the encoded and encrypted view state is checked to verify that it has not been tampered with on the client.

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.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Reference

Page Class

Page Members

System.Web.UI Namespace

EnableViewState