Occurs when a user submits login information, before authentication takes place.
(in System.Web.dll)
Visual Basic (Declaration)
Public Event LoggingIn As LoginCancelEventHandler
Dim instance As Login
Dim handler As LoginCancelEventHandler
AddHandler instance.LoggingIn, handler
public event LoginCancelEventHandler LoggingIn
public:
event LoginCancelEventHandler^ LoggingIn {
void add (LoginCancelEventHandler^ value);
void remove (LoginCancelEventHandler^ value);
}
JScript does not support events.
<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" "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>
<%@ 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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, 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, 2.0
Reference
Other Resources