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PagesSection.EnableViewStateMac Property

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)

'Declaration
<ConfigurationPropertyAttribute("enableViewStateMac", DefaultValue := True)> _
Public Property EnableViewStateMac As Boolean

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 true.

A view-state MAC is an encrypted version of the hidden variable that a page's view state is persisted to when the page is sent to the browser. When this property is set to 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, even if the application or page does not use view state. The view state MAC helps ensure the security of other ASP.NET functions in addition to the view state.

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

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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