Codebehind Mobile Device Check

  
                    public static bool IsMobileUser()
                        {
                            string UserDevice = HttpContext.Current.Request.ServerVariables["HTTP_USER_AGENT"];

                            //Due to length I removed the devices from the regex for the displayed code snippet.
                            Regex MobileDevices = new Regex(, RegexOptions.IgnoreCase);
                            Regex OtherDevices = new Regex(, RegexOptions.IgnoreCase);

                            if (MobileDevices.IsMatch(UserDevice) || OtherDevices.IsMatch(UserDevice.Substring(0, 4)))
                                return true;
                            else
                                return false;
                            }