Culture dependant formatig of digit grouping issue

Dear all,

I have an application which is culkture dependant for which I shold be able to display value based on current culture

For that I have a snipet of a single binding as below :

Data="{Binding Value,Converter={StaticResource DataConverter}

In Value is a digit as 1234, then if I am in :

- US english culture Data should be formated and display as 1,234
- Frenc culture Data should be formated and display as 1234

When I use a converter I have notice that the Culture paramter is all time set to US-English. In order that WPF take care of region settign change I have added in my app.xaml followinf code in OmnStartup:

FrameworkElement.LanguageProperty.OverrideMetadata(
			typeof(FrameworkElement),
			new FrameworkPropertyMetadata(
				XmlLanguage.GetLanguage(
				CultureInfo.CurrentCulture.IetfLanguageTag)));

My converter is as simple as below :

public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is double)
            {
                 if (value >= 1000)
              {
                //higher than 1000 incl
                return value.ToString("N0"); //xxxx
            }
            }

			return value;
			//return (string)value;

		}

When I am in english all is fine but as soon as I switch in Frenc for instance I get an exception input string not in correct format when the binding occurs.

Any idea how to solve the issue

regards