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FormsAuthentication.RedirectFromLoginPage Method (String, Boolean)

Redirects an authenticated user back to the originally requested URL or the default URL.

Namespace:  System.Web.Security
Assembly:  System.Web (in System.Web.dll)
public static void RedirectFromLoginPage(
	string userName,
	bool createPersistentCookie
)

Parameters

userName
Type: System.String

The authenticated user name.

createPersistentCookie
Type: System.Boolean

true to create a durable cookie (one that is saved across browser sessions); otherwise, false.

ExceptionCondition
HttpException

The return URL specified in the query string contains a protocol other than HTTP: or HTTPS:.

The RedirectFromLoginPage method redirects to the URL specified in the query string using the ReturnURL variable name. For example, in the URL http://www.contoso.com/login.aspx?ReturnUrl=caller.aspx, the RedirectFromLoginPage method redirects tothe return URL caller.aspx. If the ReturnURL variable does not exist, the RedirectFromLoginPage method redirects to the URL in the DefaultUrl property.

ASP.NET automatically adds the return URL when the browser is redirected to the login page.

By default, the ReturnUrl variable must refer to a page within the current application. If ReturnUrl refers to a page in a different application or on a different server, the RedirectFromLoginPage methods redirects to the URL in the DefaultUrl property. If you want to allow redirects to a page outside the current application, you must set the EnableCrossAppRedirects property to true using the enableCrossAppRedirects attribute of the forms configuration element.

Security noteSecurity Note

Setting the EnableCrossAppRedirects property to true to allow cross-application redirects is a potential security threat. For more information, see the EnableCrossAppRedirects property.

If the CookiesSupported property is true, and either the ReturnUrl variable is within the current application or the EnableCrossAppRedirects property is true, then the RedirectFromLoginPage method issues an authentication ticket and places it in the default cookie using the SetAuthCookie method.

If CookiesSupported is false and the redirect path is to a URL in the current application, the ticket is issued as part of the redirect URL. If CookiesSupported is false, EnableCrossAppRedirects is true, and the redirect URL does not refer to a page within the current application, the RedirectFromLoginPage method issues an authentication ticket and places it in the QueryString property.

The following code example redirects validated users to either the originally requested URL or the DefaultUrl. The code example uses ASP.NET membership to validate users. For more information about ASP.NET membership, see Managing Users by Using Membership.

Security noteSecurity Note

This example contains a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web.Security" %>

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

public void Login_OnClick(object sender, EventArgs args)
{
   if (Membership.ValidateUser(UsernameTextbox.Text, PasswordTextbox.Text))
      FormsAuthentication.RedirectFromLoginPage(UsernameTextbox.Text, NotPublicCheckBox.Checked);
   else
     Msg.Text = "Login failed. Please check your user name and password and try again.";
}


</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
  <title>Login</title>
</head>
<body>

<form id="form1" runat="server">
  <h3>Login</h3>

  <asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />

  Username: <asp:Textbox id="UsernameTextbox" runat="server" /><br />
  Password: <asp:Textbox id="PasswordTextbox" runat="server" TextMode="Password" /><br />

  <asp:Button id="LoginButton" Text="Login" OnClick="Login_OnClick" runat="server" />
  <asp:CheckBox id="NotPublicCheckBox" runat="server" /> 
  Check here if this is <span style="text-decoration:underline">not</span> a public computer.

</form>

</body>
</html>

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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