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FormsAuthenticationConfiguration.SlidingExpiration Property

Gets or sets the authentication sliding expiration.

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

Property Value

Type: System.Boolean
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 = 
                formsAuthentication.SlidingExpiration;

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




.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

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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