public static string GetUa(HttpRequest hr)
{
    try
    {
        string visitorBrowser = hr.UserAgent.ToString();
        string originalBrowser = hr.ServerVariables["X-OperaMini-Phone-UA"];
        string anotherOriginalBrowser = hr.ServerVariables["X-Device-User-Agent"]; //novarra

        if (!String.IsNullOrEmpty(originalBrowser))
        {
            return "OPERAMINI " + originalBrowser;
        }
        else
        {
            if (!String.IsNullOrEmpty(anotherOriginalBrowser))
            {
                return "NOVARRA " + anotherOriginalBrowser;
            }
            else
            {
                return visitorBrowser;
            }
        }
    }
    catch
    {
        return "No UA Found";
    }
}