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FormsAuthentication.EnableFormsAuthentication Method

Enables forms authentication.

Namespace:  System.Web.Security
Assembly:  System.Web (in System.Web.dll)
public static void EnableFormsAuthentication(
	NameValueCollection configurationData


Type: System.Collections.Specialized.NameValueCollection

A name-value collection that contains values for "defaultUrl" and/or "loginUrl". The parameter can be null if there are no values for the default URL or the login URL.


The application is not in the pre-start initialization phase.

If the DefaultUrl property is null, that property is set to the default URL value from the configurationData parameter. If the LoginUrl property is null, that property is set to the login URL value from the configurationData parameter.

.NET Framework

Supported in: 4.5.1, 4.5, 4

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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