Base MVC Controller using cultures - to be used with LocalisationHelper

BaseController.cs

public abstract partial class BaseController : Controller
    {
        private const string _langCookie = "lang";

        protected override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            SetCurrentCulture();
            base.OnActionExecuting(filterContext);
        }

        protected override void OnException(ExceptionContext filterContext)
        {
            base.OnException(filterContext);
        }

        private void SetCurrentCulture()
        {
            if(Request.Cookies[_langCookie] == null || String.IsNullOrEmpty(Request.Cookies[_langCookie].Value))
            {
                string culture;
                if(Request.UserLanguages != null && Request.UserLanguages[0] != null)
                {
                    culture = LocalisationHelper.GetCulture(Request.UserLanguages[0]);
                }
                else
                {
                    culture = LocalisationHelper.DefaultCulture;
                }
                Response.Cookies.Add(new HttpCookie(_langCookie, culture));
            }
            Thread.CurrentThread.CurrentUICulture = new CultureInfo(Request.Cookies[_langCookie].Value);
        }
    }