The nhibernate error . . .

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NHibernate

i am geting exeption
"The hibernate.connection.driver_class must be specified in the NHibernate configuration section.
at ISessionFactory factory = cfg.BuildSessionFactory();

below is my both code file web.config and helper class

{
            //NHibernate.Cfg.Configuration cfg = new NHibernate.Cfg.Configuration();

            Configuration cfg = new Configuration();
            cfg.AddAssembly("NHsemple");
      "Web.config"));

            ISessionFactory factory = cfg.BuildSessionFactory();
            ISession session = factory.OpenSession();
            ITransaction transaction = session.BeginTransaction();

            School newUser = new School();

            newUser.FirstName = TextBox1.Text;
            newUser.LastName = TextBox2.Text;
            newUser.PersonID = Convert.ToInt32(TextBox3.Text);
            newUser.HireDate = DateTime.Now;
            newUser.EnrollmentDate = DateTime.Now;

            // Tell NHibernate that this object should be saved
            session.Save(newUser);

            // commit all of the changes to the DB and close the ISession
            transaction.Commit();
            // Closing the session
            session.Close();
        }



<?xml version="1.0"?>

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

<configuration>

    <configSections>
      <section
        name="hibernate-configuration"
        type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate" />
    </configSections>
    <hibernate-configuration xmlns="urn:nhibernate-configuration-1.2">
      <session-factory>
        <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
        <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
        <property name="connection.connection_string">Data Source=.\sqlexpress;Initial Catalog=STUD;Integrated Security=True;</property>
        <property name="show_sql">true</property>
        <property name="dialect">NHibernate.Dialect.MsSql2008Dialect</property>
        <property name="proxyfactory.factory_class">NHibernate.Bytecode.DefaultProxyFactoryFactory, NHibernate</property>
        <!-- Not necessary! -->
        <property name="current_session_context_class">web</property>
      </session-factory>
    </hibernate-configuration>


  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Iesi.Collections"
                          publicKeyToken="aa95f207798dfdb4"
                          culture="neutral" />
        <bindingRedirect oldVersion="1.0.0.3"
                         newVersion="1.0.1.0"/>
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
   <!-- </configSections>-->

  <connectionStrings>
    <add name="ApplicationServices"
         connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true"
         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>