求救:缓存写入失败

[农夫it]

string cacheName = "ask_model_" + Id.ToString();
model = HttpContext.Current.Cache[cacheName] as Ask;
if (model == null)
{
model = bll.GetModel(Id);
if (model == null)
{
Response.Redirect("error.aspx");
Response.End();
}

Response.Write("丫的Model空啊<br/>");
HttpContext.Current.Cache.Add(cacheName, model, null,Cache.NoAbsoluteExpiration, new TimeSpan(0, 0, 30), CacheItemPriority.Default, null);//缓存30秒

}


将model写入缓存为何会失败呢？每次都会执行 Response.Write("丫的Model空啊<br/>"); 同样的方法在另外一个页面又没问题,郁闷了....

[农夫it]

怎么没人呢 ？