Localization help in wpf

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WPF

localization

I am working on Localization in WPF.I have two resources files one for english and one for french.Through dropdownlist i am changing the language but the text is not changing according to the language

private void cmb_Loaded_1(object sender, RoutedEventArgs e)
      {
          cmb.Items.Add("en-US");
          cmb.Items.Add("fr-FR");
      }

      private void cmb_SelectionChanged(object sender, SelectionChangedEventArgs e)
      {
          var comboBox = sender as ComboBox;
          string value = comboBox.SelectedItem as string;
          Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo(value);
          SelectLanguage(value);
          InitializeComponent();
      }

  private void SelectLanguage(string str)
        {

            // Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo(str);
            switch (str)
            {
                case "en-US":

                    TranslationManager.Instance.TranslationProvider = new ResxTranslationProvider
                                ("WpfAppl.Global-en-US", Assembly.GetExecutingAssembly());
                    break;
                case "fr-FR":

                    TranslationManager.Instance.TranslationProvider = new ResxTranslationProvider
                                ("WpfAppl.Global-fr-FR", Assembly.GetExecutingAssembly());

                    break;
}