ho creato una directory all'interno dell'app_code, dovrebbe bastare inserirenel web.config il tag <codeSubDirectories> ed aggiungere il nome della nuova cartella, ma va in errore e non riesco a capirne il motivo:

"The element 'codeSubDirectories' cannot be defined below the application level"

<?xml version="1.0"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
<connectionStrings>
<add name="ConnectionString" connectionString="" providerName="System.Data.OracleClient" />
</connectionStrings>
<system.web>
<customErrors mode="Off"/>
<compilation debug="true">
<codeSubDirectories>
<add directoryName="LayoutFatture"/>
</codeSubDirectories>
<assemblies>
<add assembly="System.Data.OracleClient, Version=2.0.0.0, Culture=neutral"/>
</assemblies>
</compilation>
</system.web>
</configuration>