Trying to change timezones on the fly

[Youraputz]

I'm currently writing some c# code for the .net cf on CE 5.0, part of
this requires the user to be able to change the date/time/timezone.
After doing a bit of research I've successfully set the date, time and
timezone of the system, however my application does not recieve the new
timezone info unless I restart it. According to pinvoke.net this is
the expected behavior because the .net environment is not updated, so
all subsequent calls to DateTime are using the old timezone info. What
I need to do is make this update (if possible).

What I'm currently trying is to use SendMessage() function from
coredll.dll in order to broadcast a message that will cause this
update. Is this appropriate? possible? If so perhaps I'm closer than I
think. Here is my code:

[DllImport("coredll.dll")]
private static extern int SendMessage(IntPtr hWnd, uint msg, int
wParam, int lParam);

// Alert of change
IntPtr HWND_BROADCAST = 0xFFFF;
uint WM_SETTINGCHANGE = 0x001A;
SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, 0, 0);

The obvious issue to me is that both wParam and lParam are 0, and
perhaps they are not supposed to be. Any advice would be much
appreciated.

 

[Guest]

There's nothing you can do about it. The CLR loads the timezone/dst info at
startup and that's it. Your best bet is to never use DateTime.Now, but
instead P/Invoke to GetLocalTime, which will reflect the changes.