Hi Philippe,
Whether you modify the culture of main thread in this scenario. You just also use the following code snippet to modify the culture in Callback function to implement your requirement.
CultureInfo culture4 = new CultureInfo("fr-BE");
System.Threading.Thread.CurrentThread.CurrentCulture = culture4;
System.Threading.Thread.CurrentThread.CurrentUICulture = culture4;
Best regards,
Riquel
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