我想检查页面的状态(404、移动等)。我能怎么做?ATM我做以下只告诉我如果页面存在与否。同时,我怀疑异常使我的代码慢(我测试)

static public bool CheckExist(string url)
        {
            HttpWebRequest wreq = null;
            HttpWebResponse wresp = null;
            bool ret = false;

            try
            {
                wreq = (HttpWebRequest)WebRequest.Create(url);
                wreq.KeepAlive = true;
                //wreq.Method = "HEAD";
                wresp = (HttpWebResponse)wreq.GetResponse();
                ret = true;
            }
            catch (System.Net.WebException)
            {
            }
            finally
            {
                if (wresp != null)
                    wresp.Close();
            }
            return ret;
        }