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IAuthenticationModule.PreAuthenticate Method

Returns an instance of the Authorization class for an authentication request to a server.

Namespace:  System.Net
Assembly:  System (in System.dll)

function PreAuthenticate(
	request : WebRequest, 
	credentials : ICredentials
) : Authorization


Type: System.Net.WebRequest

The WebRequest instance associated with the authentication request.

Type: System.Net.ICredentials

The credentials associated with the authentication request.

Return Value

Type: System.Net.Authorization
An Authorization instance containing the authorization message for the request.

When the CanPreAuthenticate property is true, the PreAuthenticate method will return an instance of the Authorization class containing an authentication message.

The following example shows how to use the PreAuthenticate method. For a complete example refer to the AuthenticationManager class.

No code example is currently available or this language may not be supported.
// The PreAuthenticate method specifies if the authentication implemented
// by this class allows pre-authentication.
// Even if you do not use it, this method must be implemented to obey to the rules
// of interface implemebtation.
// In this case it always returns null.
Authorization * PreAuthenticate(WebRequest* request, ICredentials* credentials) {
   return 0;

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, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0