Normally you can get it by writing something like
CultureInfo currentCulture = Thread.CurrentThread.CurrentCulture;
But this way you can only get CultureInfo which was configured at the moment application was launched and will not update if the setting have been changed afterwards.
So, how to get CultureInfo currently configured in Control Panel -> Regional and Language Settings?
You can use Win32 API function GetSystemDefaultLCID. The signiture is as follow:
[DllImport("kernel32.dll")]
static extern uint GetSystemDefaultLCID();
GetSystemDefaultLCID function returns the LCID. It can map language string from the folowing table. Locale IDs Assigned by Microsoft
[DllImport("kernel32.dll")]
private static extern int GetUserDefaultLCID();
public static CultureInfo CurrentCultureInRegionalSettings => new CultureInfo(GetUserDefaultLCID());
This simple code worked for me (avoiding caching):
// Clear cached data for the current culture
Thread.CurrentThread.CurrentCulture.ClearCachedData();
// In a new thread instance we get current culture.
// This code avoid getting wrong cached cultureinfo objects when user replaces some values in the regional settings without restarting the application
CultureInfo currentCulture = new Thread(() => { }).CurrentCulture;