.NE 后退刷新验证码

        Response.Buffer = true;
        Response.Expires = -1;
        Response.ExpiresAbsolute = DateTime.Now.AddDays(-1);
        Response.Expires=0;
        Response.CacheControl = "no-cache";

转载于:https://www.cnblogs.com/lmjob/archive/2008/09/01/1280965.html