SlidingExpiration Property

FormsAuthenticationConfiguration.SlidingExpiration Property

Gets or sets the authentication sliding expiration.

Namespace: System.Web.Configuration
Assembly: System.Web (in system.web.dll)

public bool SlidingExpiration { get; set; }
/** @property */
public boolean get_SlidingExpiration ()

/** @property */
public void set_SlidingExpiration (boolean value)

public function get SlidingExpiration () : boolean

public function set SlidingExpiration (value : boolean)

Not applicable.

Property Value

true if the sliding expiration is enabled; otherwise, false. The default is true.

When the SlidingExpiration is set to true, the time interval during which the authentication cookie is valid is reset to the expiration Timeout property value. This happens if the user browses after half of the timeout has expired. For example, if you set an expiration of 20 minutes by using sliding expiration, a user can visit the site at 2:00 PM and receive a cookie that is set to expire at 2:20 PM. The expiration is only updated if the user visits the site after 2:10 PM. If the user visits the site at 2:09 PM, the cookie is not updated because half of the expiration time has not passed. If the user then waits 12 minutes, visiting the site at 2:21 PM, the cookie will be expired.

The following code example shows how to access the SlidingExpiration property. Refer to the code example in the FormsAuthenticationConfiguration class topic to learn how to get the section.

// Get the current SlidingExpiration.
bool currentSlidingExpiration = 

// Set the SlidingExpiration.
formsAuthentication.SlidingExpiration = false;

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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