Authenticate Method

FormsAuthentication.Authenticate Method (String, String)

Note: This API is now obsolete.

Validates a user name and password against credentials stored in the configuration file for an application.

Namespace:   System.Web.Security
Assembly:  System.Web (in System.Web.dll)

[ObsoleteAttribute("The recommended alternative is to use the Membership APIs, such as Membership.ValidateUser. For more information, see")]
public static bool Authenticate(
	string name,
	string password


Type: System.String

The user name.

Type: System.String

The password for the user.

Return Value

Type: System.Boolean

true if the user name and password are valid; otherwise, false.

The Authenticate method verifies user credentials that are stored in the section of the application configuration file. Alternatively, you can use ASP.NET membership to store user credentials and call the ValidateUser to verify the credentials. For more information, see Managing Users by Using Membership.

For improved security, you can encrypt passwords stored in the configuration file for an application by using the HashPasswordForStoringInConfigFile method.

The following code example shows user credentials stored in the Web.config file for an application. The password values have been hashed using the HashPasswordForStoringInConfigFile method.

<authentication mode="Forms">

<forms loginUrl="login.aspx">

<credentials passwordFormat="SHA1">

<user name="user1" password="27CE4CA7FBF00685AF2F617E3F5BBCAFF7B7403C" />

<user name="user2" password="D108F80936F78DFDD333141EBC985B0233A30C7A" />

<user name="user3" password="7BDB09781A3F23885CD43177C0508B375CB1B7E9"/>




The following code example shows a login page that uses the Authenticate method to validate user credentials.

System_CAPS_security Security 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"
<script runat="server">

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


<html xmlns="" >

<form id="form1" runat="server">

  <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.



.NET Framework
Available since 1.1
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