Click to Rate and Give Feedback
MSDN
MSDN Library
.NET Development
.NET Framework 3.5
Login Class
Login Events
 LoggingIn Event
This page is specific to
Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:
.NET Framework Class Library
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)

Visual Basic (Declaration)
Public Event LoggingIn As LoginCancelEventHandler
Visual Basic (Usage)
Dim instance As Login
Dim handler As LoginCancelEventHandler

AddHandler instance.LoggingIn, handler
C#
public event LoginCancelEventHandler LoggingIn
Visual C++
public:
 event LoginCancelEventHandler^ LoggingIn {
    void add (LoginCancelEventHandler^ value);
    void remove (LoginCancelEventHandler^ value);
}
J#
/** @event */
public void add_LoggingIn (LoginCancelEventHandler value)
/** @event */
public void remove_LoggingIn (LoginCancelEventHandler value)
JScript
JScript does not support events.
ASP.NET
<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.

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<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
    Else
        Login1.InstructionText = String.Empty
    End If
End Sub

</script>

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

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

bool IsValidEmail(string strIn)
{
    // Return true if strIn is in valid e-mail format.
    return Regex.IsMatch(strIn, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"); 
}

void OnLoggingIn(object sender, System.Web.UI.WebControls.LoginCancelEventArgs e)
{
    if (!IsValidEmail(Login1.UserName))
    {
        Login1.InstructionText = "You must enter a valid e-mail address.";
        e.Cancel = true;
    }
    else
    {
        Login1.InstructionText = String.Empty;
    }
}

</script>

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

Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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 SP1, 3.0, 2.0 SP1, 2.0
Tags What's this?: Add a tag
Community Content   What is Community Content?
Add new content      
Processing
© 2008 Microsoft Corporation. All rights reserved. Terms of Use  |  Trademarks  |  Privacy Statement
Page view tracker