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PagesSection.EnableViewStateMac Property

Updated: May 2010

Gets or sets a value that specifies whether ASP.NET should run a message authentication code (MAC) on the page's view state when the page is posted back from the client.

Namespace:  System.Web.Configuration
Assembly:  System.Web (in System.Web.dll)
[ConfigurationPropertyAttribute("enableViewStateMac", DefaultValue = true)]
public bool EnableViewStateMac { get; set; }

Property Value

Type: System.Boolean
true if ASP.NET should run a message authentication code (MAC) on the page's view state when the page is posted back from the client; otherwise, false. The default is false.

A view-state MAC is an encrypted version of the hidden variable that a page's view state is persisted to when sent to the browser. If true, the encrypted view state is checked to verify that it has not been tampered with on the client.

Security noteSecurity Note:

This attribute should never be set to false in a production Web site.

The following code example shows how to use the EnableViewStateMac property.

// Get the current EnableViewStateMac property value.
Console.WriteLine(
    "Current EnableViewStateMac value: '{0}'",
    pagesSection.EnableViewStateMac);

// Set the EnableViewStateMac property to true.
pagesSection.EnableViewStateMac = true;

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0

Date

History

Reason

May 2010

Added a security note.

Customer feedback.

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