Create DynamicContent Item on Multiple Languages at once. Tested in 9.1

CreateDynamicContentItemMultipleCultures.cs

protected void btn_Click(object sender, EventArgs e)
{
    DynamicModuleManager dynamicModuleManager = DynamicModuleManager.GetManager();
    Type personType = TypeResolutionService.ResolveType("Telerik.Sitefinity.DynamicTypes.Model.People.Person");

    DynamicContent personItem = dynamicModuleManager.CreateDataItem(personType);
    personItem.SetValue("Owner", SecurityManager.GetCurrentUserId());
    personItem.SetValue("PublicationDate", DateTime.Now);
    
    //to prevent adding 3 items in DB
    dynamicModuleManager.Lifecycle.Publish(personItem);
    dynamicModuleManager.SaveChanges();

    CultureInfo[] languages = SystemManager.CurrentContext.AppSettings.DefinedFrontendLanguages;
    foreach (var lang in languages)
    {
        Thread.CurrentThread.CurrentUICulture = lang;

        personItem = dynamicModuleManager.Lifecycle.CheckOut(personItem, lang) as DynamicContent;

        personItem.SetString("Title", string.Concat("Some Title ", lang), lang);
        personItem.SetString("FullName", string.Concat("Some FullName ", lang), lang);
        personItem.SetValue("Gender", "Male");

        personItem.SetString("UrlName", string.Concat("SomeUrlName", lang), lang);

        personItem.SetWorkflowStatus(dynamicModuleManager.Provider.ApplicationName, "Published", lang);

        personItem = dynamicModuleManager.Lifecycle.CheckIn(personItem) as DynamicContent;
        dynamicModuleManager.Lifecycle.Publish(personItem);
    }
    
    dynamicModuleManager.SaveChanges();
}