Open Url & Set CookieContainer for phone web browser

I am using C # and Windows Phone 8.1 as Universal.

I am using this code to set a cookieContainer on HttpWebRequest and access my site.

    CookieContainer cookieContainer = new CookieContainer();

    public async Task<string> Begin(string url, bool saveCookie = false)
    {
        string pageSource = "";
        HttpWebRequest request;
        request = (HttpWebRequest)WebRequest.Create(url);
        //request.Method = "Get";
        if (cookieContainer != null && saveCookie)
            request.CookieContainer = cookieContainer;

        try
        {
            HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync();
            pageSource = new StreamReader(response.GetResponseStream()).ReadToEnd();
            pageSource = System.Net.WebUtility.HtmlDecode(pageSource);
        }
        catch { }
        return pageSource;
    }

      

        
        
        
      

    

Now I need to open a URL with the phone's web browser {Internet Explorer} (for the checkout page). how can i trigger url with this CookieContainer in IE?

Also I know that with this code it is possible to run url>

            var options = new Windows.System.LauncherOptions();
            options.TreatAsUntrusted = false;
            await Windows.System.Launcher.LaunchUriAsync(new Uri("url"), options);

      

        
        
        
      

    

Thank.