Umbraco v6 change templates

Umbv6ChangeTemplate

        var contentService = ApplicationContext.Current.Services.ContentService;
        var content = contentService.GetById(1538);

        //quick change lots of nodes template
        var fileService = ApplicationContext.Current.Services.FileService;
        var template = fileService.GetTemplate("CJ-Content"); 
        foreach(var item in content.Children())
        {
            item.Template = template;
            contentService.Save(item);
        }