ASP.NET Tutorial/Authentication Authorization/Login

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Performing Custom Authentication with the Login Control

By default, the Login control uses ASP.NET Membership to authenticate a username and password. 
To change this default setting, you can handle the Login control"s Authenticate event.
To use a list of usernames and passwords in the web configuration file. 
File: Web.config
<configuration>
  <system.web>
    <authentication mode="Forms">
      <forms>
        <credentials passwordFormat="Clear">
          <user name="Bill" password="secret" />
          <user name="Ted" password="secret" />
        </credentials>
      </forms>
    </authentication>
  </system.web>
</configuration>

File: LoginCustom.aspx
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
    {
        string userName = Login1.UserName;
        string password = Login1.Password;
        e.Authenticated = FormsAuthentication.Authenticate(userName, password);
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Login Custom</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Login
        id="Login1"
        OnAuthenticate="Login1_Authenticate"
        Runat="server" />
    </div>
    </form>
</body>
</html>


Using a Template with the Login Control

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Login Template</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Login
        id="Login1"
        Runat="server">
        <LayoutTemplate>
        <asp:Label
            id="FailureText"
            EnableViewState="false"
            CssClass="loginError"
            Runat="server" />
        <br />
        <asp:Label
            id="lblUserName"
            AssociatedControlID="UserName"
            Text="User Name:"
            Runat="server" />
        <br />
        <asp:TextBox
            id="UserName"
            Runat="server" />
        <br /><br />
        <asp:Label
            id="lblPassword"
            AssociatedControlID="Password"
            Text="Password:"
            Runat="server" />
        <br />
        <asp:TextBox
            id="Password"
            TextMode="Password"
            Runat="server" />
        <br /><br />
        <asp:Button
            id="btnLogin"
            Text="Login"
            CommandName="Login"
            Runat="server" />
        </LayoutTemplate>
    </asp:Login>
    </div>
    </form>
</body>
</html>


Using the Login server control on the Login.aspx page (C#)

<%@ Page Language="C#" %>
<script runat="server">
    protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
    {
        if (Login1.UserName == "A" && Login1.Password == "B") {
            FormsAuthentication.RedirectFromLoginPage(Login1.UserName,
               Login1.RememberMeSet);
        }
        else {
            Response.Write("Invalid credentials");
        }
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Login Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Login ID="Login1" runat="server" OnAuthenticate="Login1_Authenticate">
        </asp:Login>
    </div>
    </form>
</body>
</html>


Using the Login server control on the Login.aspx page (VB)

<%@ Page Language="VB" %>
<script runat="server">
    Protected Sub Login1_Authenticate(ByVal sender As Object, _
      ByVal e As System.Web.UI.WebControls.AuthenticateEventArgs)
        If (Login1.UserName = "A" And Login1.Password = "B") Then
            FormsAuthentication.RedirectFromLoginPage(Login1.UserName, _
               Login1.RememberMeSet)
        Else
            Response.Write("Invalid credentials")
        End If
    End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Login Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Login ID="Login1" runat="server" OnAuthenticate="Login1_Authenticate">
        </asp:Login>
    </div>
    </form>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Authentication_Authorization/Login&oldid=2860»