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Page.EnableViewStateMac Property

Gets or sets a value indicating whether ASP.NET should check 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)

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

Do not set this property in code. Set the EnableViewStateMac attribute using the @ Page directive in the .aspx file. When the page is requested, the dynamically generated class sets the property.

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 view state.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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