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.

 property bool EnableViewStateMac { bool get(); void set(bool value); };
 property bool EnableViewStateMac { bool get(); void set(bool value); };
protected bool EnableViewStateMac { get; set; }
public bool EnableViewStateMac { get; set; }
member this.EnableViewStateMac : bool with get, set
Protected Property EnableViewStateMac As Boolean
Public Property EnableViewStateMac As Boolean

Property Value


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.


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.

Applies to

See also