[Vala] static string variable is empty!

Hello everybody!
I'm a newbie to vala language, I faced to a strange problem recently and
couldn't find any help in vala documentations.
In my app, I have declared a class named "Global" in a file "global.vala":

using GLib;
public class MyApp.Global : GLib.Object {
    public static string dataDir = "/usr/local/share/";

And I have a "main.vala" file, whith this code inside:

using GLib;
using Gtk;
public class MyApp.MainWindow : Window {
   static int main (string[] args) {
      stdout.printf ("all data is in: " + Global.dataDir);
      return 0;

After compilation, I get this string in terminal:
all data is in:

Seems that Global.dataDir is empty. Where is my mistake?

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