public static bool GetClientWeb()
  {
  bool result = false;
  string clientType = string.Concat(HttpContext.Current.Request.UserAgent);
  if (clientType.ToLower().Contains("mozilla") || clientType.ToLower().Contains("opera"))
  {
  result = true;
  }
  return result;
  }

  /// <summary>
    /// 判断手机用户UserAgent
    /// </summary>
    /// <returns></returns>
    private bool IsMobile()
    {
       
        HttpContext context = HttpContext.Current;
        if (context != null)
        {
            HttpRequest request = context.Request;
            if (request.Browser.IsMobileDevice)
                return true;

            string MobileUserAgent=System.Configuration.ConfigurationManager.AppSettings["MobileUserAgent"];
            Regex MOBILE_REGEX = new Regex(MobileUserAgent);
            if (string.IsNullOrEmpty(request.UserAgent) || MOBILE_REGEX.IsMatch(request.UserAgent.ToLower()))
                return true;
            
          
            
        }

        return false;
    }

以下为web.config配置里边的
<add key="MobileUserAgent" value="iphone|android|nokia|symbian|sony|ericsson|mot|samsung|sgh|lg|philips|panasonic|alcatel|lenovo|cldc|midp|wap|mobile|blackberry|windows ce|motorola|mqqbrowser|ucweb"/>