Untitled

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="webLogin.aspx.cs" Inherits="capaPresentacion.webLogin" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <style type="text/css">
        .auto-style1 {
            margin-left: 371px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:Login ID="Login" runat="server" OnAuthenticate="Login_Authenticate" BackColor="#EFF3FB" BorderColor="#B5C7DE" BorderPadding="4" BorderStyle="Solid" BorderWidth="1px" CssClass="auto-style1" Font-Names="Verdana" Font-Size="0.8em" ForeColor="#333333">
            <InstructionTextStyle Font-Italic="True" ForeColor="Black" />
            <LoginButtonStyle BackColor="White" BorderColor="#507CD1" BorderStyle="Solid" BorderWidth="1px" Font-Names="Verdana" Font-Size="0.8em" ForeColor="#284E98" />
            <TextBoxStyle Font-Size="0.8em" />
            <TitleTextStyle BackColor="#507CD1" Font-Bold="True" Font-Size="0.9em" ForeColor="White" />
        </asp:Login>

    </div>
    </form>
</body>
</html>


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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using capaLogicaNegocio;
using System.IO;
using System.Xml.Serialization;
using System.Web.Security;

namespace capaPresentacion
{
    public partial class webLogin : System.Web.UI.Page
    {
        CL_Usuario usuario = new CL_Usuario();
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Login_Authenticate(object sender, AuthenticateEventArgs e)
        {
            servicioAutenticacion.OperacionesClient servicio = new servicioAutenticacion.OperacionesClient();

            XmlSerializer serializador = new XmlSerializer(typeof(CL_Usuario));

            StringReader lector = new StringReader(servicio.validar(Login.UserName, Login.Password));

            CL_Usuario usu =   (CL_Usuario)serializador.Deserialize(lector);

            if (usu != null)
            {
                Login.UserName = usu.Nombre + " " + usu.Apellido;
                e.Authenticated = true;

                Session["Usuario Valido"] = usu;

                //el redirect no funciona si no agrega la etiqueta <authorization> y <authentication> en el Web.Config
                FormsAuthentication.RedirectFromLoginPage(Login.UserName, false);
            }
        }
    }
}