MobileFormsAuthentication Class

Supports cookieless devices by appending appropriate authentication information to the appropriate URLs.

Namespace: System.Web.Mobile
Assembly: System.Web.Mobile (in

public class MobileFormsAuthentication
public class MobileFormsAuthentication
public class MobileFormsAuthentication
Not applicable.

This helper class is designed to assist with writing authenticated mobile Web sites. The class objects provide mobile device-compatible versions of the ASP.NET FormsAuthentication class methods, RedirectFromLoginPage and SignOut. For more information on securing your Web application, see Basic Security Practices for Web Applications.

The following code example shows a login.aspx page. The authentication is validated using the ValidateUser function. The Membership class relies on membership providers to communicate with a data source.

<%@ Page Language="C#" 
    Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile" 
    Assembly="System.Web.Mobile" %>
<%@ Import Namespace="System.Web.Security" %>
<%@ Import Namespace="System.Web.Mobile" %>

<script runat="server">
private void Login_Click(Object sender, EventArgs e)
// Perform Authentication check here by using 
// UserEmail.Value and UserPswd.Value.
    if (Membership.ValidateUser(UserEmail.Text, UserPswd.Text))
        // Set the authorization cookie
        FormsAuthentication.SetAuthCookie(UserEmail.Text, false);
        // Redirect from login page
        MobileFormsAuthentication.RedirectFromLoginPage(UserEmail.Text, true);
        // Notify the user
        lblError.Text = "Login invalid. Please check your credentials";

<html xmlns="" >
    <mobile:form id="form1" runat="server">
        <Mobile:Label runat="server">Enter username</Mobile:Label>
        <Mobile:TextBox id="UserEmail" runat="Server"/>
        <Mobile:Label runat="server">Enter password</Mobile:Label>
        <Mobile:TextBox id="UserPswd" runat="Server"/>
        <Mobile:Command ID="Command1" runat="Server" OnClick="Login_Click"  
        <Mobile:Label runat="server" id="lblError" />

  • AspNetHostingPermission  for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.
  • AspNetHostingPermission  for operating in a hosted environment. Demand value: InheritanceDemand; Permission value: Minimal.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1