AuthenticationService.Authenticating Event


Occurs when user credentials are being validated.

 static event EventHandler<System::Web::ApplicationServices::AuthenticatingEventArgs ^> ^ Authenticating;
public static event EventHandler<System.Web.ApplicationServices.AuthenticatingEventArgs> Authenticating;
member this.Authenticating : EventHandler<System.Web.ApplicationServices.AuthenticatingEventArgs> 
Public Shared Custom Event Authenticating As EventHandler(Of AuthenticatingEventArgs) 


The following example shows how to bind an event handler for the Authenticating event in the Application_Start method of the Global.asax file.

void Application_Start(object sender, EventArgs e) 
    System.Web.ApplicationServices.AuthenticationService.Authenticating += 
        new EventHandler<System.Web.ApplicationServices.AuthenticatingEventArgs>(AuthenticationService_Authenticating);

Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
    AddHandler System.Web.ApplicationServices.AuthenticationService.Authenticating, _
      AddressOf Me.AuthenticationService_Authenticating
End Sub

The following example shows an event handler for the Authenticating event in the Global.asax file. The event handler reads two authentication values from the CustomCredential property and passes them together with the user name and password to a custom authentication class named StudentAuthentication.

void AuthenticationService_Authenticating(object sender, System.Web.ApplicationServices.AuthenticatingEventArgs e)
    string studentid = String.Empty;
    string answer = String.Empty;

    string[] credentials =
        e.CustomCredential.Split(new char[] { ',' });
    if (credentials.Length > 0)
        studentid = credentials[0];
        if (credentials.Length > 1)
            answer = credentials[1];

        e.Authenticated =
            (e.UserName, e.Password, studentid, answer);
    catch (ArgumentNullException ex)
        e.Authenticated = false;

    e.AuthenticationIsComplete = true;
Sub AuthenticationService_Authenticating _
   (ByVal sender As Object, _
    ByVal e As System.Web.ApplicationServices.AuthenticatingEventArgs)
    Dim studentid As String = String.Empty
    Dim answer As String = String.Empty

    Dim credentials As String() = _
         e.CustomCredential.Split(New Char() {","c})
    If (credentials.Length > 0) Then
        studentid = credentials(0)
        If (credentials.Length > 1) Then
            answer = credentials(1)
        End If
    End If

        e.Authenticated = _
            StudentAuthentication.ValidateStudentCredentials _
            (e.Username, e.Password, studentid, answer)
    Catch ex As ArgumentNullException
        e.Authenticated = False
    End Try

    e.AuthenticationIsComplete = True
End Sub


The Authenticating event is raised when user credentials are being validated. Create an event handler for the Authenticating event to customize how user credentials are validated.

Applies to

See also