Localization :: Building A Globalized Web Application?

I need to build a globalized web application, and I already have those resource files in the App_GlobalResources folder. My web application is built upon an N-tier architecture: DAL, BLL and Presentation are the layers, and we are using SQL Server 2008. We have decided that the database, BLL and DAL will always be operating using the en-US culture, but the culture in the Presentation layer can vary.

ASP.NET works with two culture properties: Culture and UICulture. There's an article in MSDN that states that a thread's UICulture determines which resource files ASP.NET picks, and Culture determines datetime/currency formating, etc.

So, to have a fully globalized application, I think I must set both Culture and UICulture, so that both Resources and datetime/currency formating are displayed using the same culture.

Then I thought I would set those culture properties (both of them) in the BeginRequest event in my web application, based on the user's choice, and that everytime a method in the BLL is called, it sets the thread's Culture property to "en-US" and, just before it returns, it sets the thread's Culture back to what it was before.