asp.net 判断是手机或电脑访问网页的方式

string osPat = "mozilla|m3gate|winwap|openwave|Windows NT|Windows 3.1|95|Blackcomb|98|ME|X Window|Longhorn|ubuntu|AIX|Linux|AmigaOS|BEOS|HP-UX|OpenBSD|FreeBSD|NetBSD|OS/2|OSF1|SUN";

            string uAgent = Request.ServerVariables["HTTP_USER_AGENT"];

            Regex reg = new Regex(osPat);

            if (reg.IsMatch(uAgent))
            {

                Response.Write("电脑访问");

            }

            else
            {
                Response.Write("手机访问");

            }