PreAuthenticate Property

WebRequest.PreAuthenticate Property


When overridden in a descendant class, indicates whether to pre-authenticate the request.

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

abstract PreAuthenticate : bool with get, set
override PreAuthenticate : bool with get, set

Property Value

Type: System.Boolean

true to pre-authenticate; otherwise, false.

Exception Condition

Any attempt is made to get or set the property, when the property is not overridden in a descendant class.

With the exception of the first request, the PreAuthenticate property indicates whether to send authentication information with subsequent requests without waiting to be challenged by the server. When PreAuthenticate is false, the WebRequest waits for an authentication challenge before sending authentication information.


The WebRequest class is an abstract class. The actual behavior of WebRequest instances at run time is determined by the descendant class returned by the WebRequest.Create method. For more information about default values and exceptions, see the documentation for the descendant classes, such as HttpWebRequest and FileWebRequest.

Legacy Code Example

The following example sets the PreAuthenticate property to true so that the NetworkCredential stored in the Credentials property will be sent to along with the resource request.

No code example is currently available or this language may not be supported.

.NET Framework
Available since 1.1
Return to top
© 2015 Microsoft