http://www.cnblogs.com/yagzh2000/archive/2013/06/09/3128042.html
http://www.cnblogs.com/henw/archive/2012/01/31/2333783.html
if ("http://" + Request.UrlReferrer.Host + ":" + Request.UrlReferrer.Port == ConfigStore.CommonSettings.App_Site_Url)
{
Random randnum = new Random();
string telcode = randnum.Next(, ).ToString();
return Json(new { flag = true });
}