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# NSMessageHandler.AuthenticationError Event

Occurs when the user could not be signed in due to authentication errors. Most likely due to an invalid account or password. Note that this event will also raise the more general ExceptionOccurred event.

[Visual Basic]
Public Event AuthenticationError As HandlerExceptionEventHandler
[C#]
public event HandlerExceptionEventHandler AuthenticationError;

#### Event Data

The event handler receives an argument of type ExceptionEventArgs containing data related to this event. The following ExceptionEventArgs property provides information specific to this event.

Property | Description
--- | ---
Exception | The exception that was raised

#### See Also

NSMessageHandler Class | XihSolutions.DotMSN Namespace