I try to redirect the page with a -NET Control but i didn't work. Can anybody halp me?

protected void Page_Load(object sender, EventArgs e)
        {
            redirectUrl();
        }

        public String GetLanguageOfBrowser()
        {
            #region WebSprachErkennung

            String strLanguage = String.Empty;

            // Sprache den Client Browser erkennen
            if (Request.ServerVariables["HTTP_ACCEPT_LANGUAGE"] != null)
            {
                strLanguage = Request.ServerVariables["HTTP_ACCEPT_LANGUAGE"];
               
                strLanguage = strLanguage.ToLower();
               
            }
            else
            {
                strLanguage = "de";
            }
                Session["MemberLanguage"] = strLanguage;

            return strLanguage;
               
            #endregion // WebSprachErkennung
           
        }

        public void redirectUrl()
        {
            String ch_de_URL = "http://www.website.ch/1.aspx";
            String ch_fr_URL = "http://www.website.ch/2.aspx";
            String ch_it_URL = "http://www.website.ch/3.aspx";
            String ch_en_URL = "http://www.website.ch/4.aspx";

            // Select
            switch (GetLanguageOfBrowser())
            {
                case "ch-de":
                    Response.Redirect(ch_de_URL);
                    break;
                case "ch-fr":
                    Response.Redirect(ch_fr_URL);
                    break;
                case "ch-it":
                    Response.Redirect(ch_it_URL);
                    break;
                case "ch-en":
                    Response.Redirect(ch_en_URL);
                    break;
                case "en":
                    Response.Redirect(ch_en_URL);
                    break;
                default:
                    Response.Redirect(ch_en_URL);
                    break;
            }

        }