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ClientWindowsAuthenticationMembershipProvider.ValidateUser Method

Automatically authenticates the current user by using the identity supplied by the operating system.

Namespace:  System.Web.ClientServices.Providers
Assembly:  System.Web.Extensions (in System.Web.Extensions.dll)

public override bool ValidateUser(
	string username,
	string password


Type: System.String

Must be Empty or null.

Type: System.String

Must be Empty or null.

Return Value

Type: System.Boolean
Always true.


username is not Empty or null.


password is not Empty or null.

When you configure your application to use the ClientWindowsAuthenticationMembershipProvider class, the static Membership.ValidateUser method will use this method for its implementation. The ClientWindowsAuthenticationMembershipProvider.ValidateUser method automatically authenticates the current user and sets the static Thread.CurrentPrincipal property to a ClientRolePrincipal object that contains the current WindowsIdentity. If a ClientRoleProvider is configured for your application, you can use the ClientRolePrincipal object to retrieve user role information from the roles service.

The following example code demonstrates how to use this method to authenticate a user by using Windows authentication.

private bool ValidateUsingWindowsAuthentication()
    ClientWindowsAuthenticationMembershipProvider authProvider =
        System.Web.Security.Membership.Provider as

    // Call ValidateUser and pass null values for the parameters. 
    // This call always returns true. 
    return authProvider.ValidateUser(null, null);

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5

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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