Global.asax code to set current thread's CultureInfo with CustomCultureUI instance

Global.asax.SetCustomCultureUI.cs

        public override void Init()
        {
            base.Init();

            BeginRequest -= OnBeginRequest;
            BeginRequest += OnBeginRequest;
        }

        private void OnBeginRequest(object sender, EventArgs eventArgs)
        {
            var locale = Request.QueryString["locale"];
            if (!string.IsNullOrEmpty(locale))
            {
                CultureInfo localeCulture = null;

                try
                {
                    localeCulture = new CultureInfo(locale);
                }
                catch (CultureNotFoundException)
                {
                    var m = Regex.Match(locale, @"^\w+-(\w+)");
                    var countryCode = m.Groups[1].Value;
                    if (!string.IsNullOrEmpty(countryCode))
                    {
                        localeCulture = new CustomCultureInfo(locale);
                    }
                }

                if (localeCulture != null)
                {
                    Thread.CurrentThread.CurrentCulture = localeCulture;
                    Thread.CurrentThread.CurrentUICulture = localeCulture;
                }
            }
        }