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Login.LoggingIn Event

Occurs when a user submits login information, before authentication takes place.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

Public Event LoggingIn As LoginCancelEventHandler
<asp:Login OnLoggingIn="LoginCancelEventHandler" />

The LoggingIn event is raised when a user submits login information but before the user is authenticated on the Web site. Use the LoggingIn event to set up any information that you need before authenticating a user.

You can cancel a login attempt during the LoggingIn event by setting the Cancel property of the CancelEventArgs object to true.

After the LoggingIn event is raised, the Login control raises the Authenticate event and then the LoggedIn event.

For more information about handling events, see Handling and Raising Events.

The following code example uses the LoggingIn event to ensure that the user has entered a well-formed e-mail address in the UserName property. If not, the LoggingIn event cancels the login attempt and displays an error message using the InstructionText property.

<%@ Page Language="VB" %>
<%@ Import Namespace="System.ComponentModel" %>
<%@ Import Namespace="System.Text.RegularExpressions" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<script runat="server">

Function IsValidEmail(ByVal strIn As String) As Boolean
    ' Return true if strIn is in valid e-mail format.
    Return Regex.IsMatch(strIn, ("^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"))
End Function

Sub OnLoggingIn(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.LoginCancelEventArgs)
    If Not IsValidEmail(Login1.UserName) Then
        Login1.InstructionText = "You must enter a valid e-mail address."
        e.Cancel = True
        Login1.InstructionText = String.Empty
    End If
End Sub


<html xmlns="" >
    <head runat="server">
    <title>ASP.NET Example</title>
        <form id="form1" runat="server">
            <asp:Login id="Login1" runat="server" 
                UserNameLabelText="E-mail Address:" 
                UserNameRequiredErrorMessage="E-mail Address.">

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.