Aiuto su autenticazione

[fermat]

mi sto cimentando con il processo di login.
nel database ho una tabella utenti dove sono registrati gli utenti e i profili.
ho aggiunto un file web.config a una sottodirectory per evitare l'accesso se nn si è registrati.
ho creato una pagina di login.
ma quello che nn ho capito è come faccio a verificare i dati.
cioè, per ora se clicco sul pulsante nn succede nulla mentre dovrebbe fare la query su db per verificare l'esistenza dell'utente.
nn capisco però dove fare ciò.
login.aspx:

<%@ Page Title="Log In" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Login.aspx.cs" Inherits="Telenews.Account.Login" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <h2>
        Log In
    </h2>
    <%--    


        Please enter your username and password.
        <asp:HyperLink ID="RegisterHyperLink" runat="server" EnableViewState="False">Register</asp:HyperLink>
        if you don't have an account.
    </p>--%>
    <asp:Login ID="LoginUser" runat="server" EnableViewState="false" RenderOuterTable="false">
        <LayoutTemplate>
            <span class="failureNotification">
                <asp:Literal ID="FailureText" runat="server"></asp:Literal>
            </span>
            <asp:ValidationSummary ID="LoginUserValidationSummary" runat="server" CssClass="failureNotification"
                ValidationGroup="LoginUserValidationGroup" />
            <div class="accountInfo">
                <fieldset class="login">
                    <legend>Account Information</legend>
                    


                        <asp:Label ID="UserNameLabel" runat="server" AssociatedControlID="UserName">Username:</asp:Label>
                        <asp:TextBox ID="UserName" runat="server" CssClass="textEntry"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="UserNameRequired" runat="server" ControlToValidate="UserName"
                            CssClass="failureNotification" ErrorMessage="User Name is required." ToolTip="User Name is required."
                            ValidationGroup="LoginUserValidationGroup">*</asp:RequiredFieldValidator>
                    </p>
                    


                        <asp:Label ID="PasswordLabel" runat="server" AssociatedControlID="Password">Password:</asp:Label>
                        <asp:TextBox ID="Password" runat="server" CssClass="passwordEntry" TextMode="Password"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="PasswordRequired" runat="server" ControlToValidate="Password"
                            CssClass="failureNotification" ErrorMessage="Password is required." ToolTip="Password is required."
                            ValidationGroup="LoginUserValidationGroup">*</asp:RequiredFieldValidator>
                    </p>
                    <%--                    


                        <asp:CheckBox ID="RememberMe" runat="server" />
                        <asp:Label ID="RememberMeLabel" runat="server" AssociatedControlID="RememberMe" CssClass="inline">Keep me logged in</asp:Label>
                    </p>--%>
                </fieldset>
                <p class="submitButton">
                    <asp:Button ID="LoginButton" runat="server" CommandName="Login" Text="Log In" ValidationGroup="LoginUserValidationGroup" />
                </p>
            </div>
        </LayoutTemplate>
    </asp:Login>
</asp:Content> 

web.config generale del sito:

<?xml version="1.0"?>

<!--
  For more information on how to configure your ASP.NET application, please visit
  [url]http://go.microsoft.com/fwlink/?LinkId=169433[/url]
  -->

<configuration>
  <connectionStrings>
    <add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true"
      providerName="System.Data.SqlClient" />
    <add name="MYTELENEWS" connectionString="Data Source=10.0.5.131;Initial Catalog=TELENEWS;Persist Security Info=True;User ID=sa;Password=sa"
      providerName="System.Data.SqlClient" />
  </connectionStrings>

  <system.web>

    <compilation debug="true" targetFramework="4.0" />

    <authentication mode="Forms">
      <forms loginUrl="~/Account/Login.aspx" timeout="2880" />
    </authentication>

    <membership>
      <providers>
        <clear/>
        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices"
             enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false"
             maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10"
             applicationName="/" />
      </providers>
    </membership>

    <profile>
      <providers>
        <clear/>
        <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/>
      </providers>
    </profile>

    <roleManager enabled="false">
      <providers>
        <clear/>
        <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" />
        <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />
      </providers>
    </roleManager>

  </system.web>

  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
</configuration>

help!!