Detects the user's authentication state and toggles the state of a link to log in to or log out of a Web site.
Assembly: System.Web (in System.Web.dll)
If you are not familiar with the set of login controls available in ASP.NET, see ASP.NET Login Controls Overview before continuing. For a list of other topics related to login controls and membership, see Managing Users by Using Membership.
When a user is not logged in to the site, the control provides a link to the login page defined in the application configuration settings. When the user is logged in to the Web site, the control provides a link to log out of the Web site. Logging out of the Web site clears the user's authentication status and when using cookies will clear the cookie from the user's client computer. On any subsequent visit to the Web site, the control will display the prompt to log in.
The logout behavior is controlled by the LogoutAction property, which specifies whether to refresh the current page, redirect the user to the login page defined in the application configuration settings, or redirect the user to a page specified by the LogoutPageUrl property. The default is to refresh the current page.
When a user uses the control to log out of a Web site, all data present in view state and all post data is lost.
The markup rendered by default for this control might not conform to accessibility standards such as the Web Content Accessibility Guidelines 1.0 (WCAG) priority 1 guidelines. For details about accessibility support for this control, see ASP.NET Controls and Accessibility.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.