HttpWebRequest webRequest = null;
StreamReader responseReader = null;
try {
//ashx Url
string getGscUserUrl = "";
//加入参数，用于更新请求
//string urlHandler = getGscUserUrl + "?id=" + Guid.NewGuid();
webRequest = (HttpWebRequest)HttpWebRequest.Create(getGscUserUrl);
webRequest.Timeout = 3000;//3秒超时
//调用ashx，并取值
responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream());
string currentUserGulid = responseReader.ReadToEnd();
return currentUserGulid.Trim();
} catch {
return "";
} finally {
responseReader.Close();
responseReader.Dispose();
}