Get start page Url in EPiServer CMS 5 or later

PageData pagedata = Global.EPDataFactory.GetPage(new PageReference(EPiServer.Configuration.Settings.Instance.PageStartId));
EPiServer.UrlBuilder url = new EPiServer.UrlBuilder(pagedata.LinkURL);
EPiServer.Global.UrlRewriteProvider.ConvertToExternal(url, pagedata.PageLink, System.Text.UTF8Encoding.UTF8);

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