This method can be used with the Sign-In page. During sign–in, the user’s language preference can be read from the database, and both the “AppCultureUI” and “AppCulture” session variables can be set or the thread cultures could be set directly. In this case, the code customization “Store Extra Information at Sign-In Time” can be used to set these values.
Creating a Multi-Lingual Application
Localizing (Internationalizing) Your Application