How can I get the selected language in the screenshot, from inside of a webpart?

I'm using sharepoint 2010. My webpart is a "visual web part" created in VS2010.
I'm trying things like "SPContext.Current.Web.CurrentUser.RegionalSettings" and "SPContext.Current.Web.Language" but ofcourse these things have nothing to do with that setting. :-|
Can someone please help me? What magical property am I looking for..