Question

I have an expiry date in my database and I would like to redirect a web page when the expiry date for that page has been reached.

How would I do this?

Thanks

Answer 1

You can do that using a cache for your pages. I’m obviously not familiar how you store the expire dates, but I’ll presume you have [exp_date: url].

So:

protected void Application_Start(object sender, EventArgs e)
{
Dictionary<Datetime, string> pages = Read_from_database();
Context.Cache.Insert("ExpireCache", pages, new CacheDependency(m_strPath),
    System.Web.Caching.Cache.NoAbsoluteExpiration, System.Web.Caching.Cache.NoSlidingExpiration,
    CacheItemPriority.Default);
}

And in

protected void Application_BeginRequest(object sender, EventArgs e)
{
    if (HttpContext.Current.Request.Url.AbsolutePath == "page_expired.aspx")
    {
        return;
    }
    var cache = HttpContext.Current.Cache["ExpireCache"];
    if (cache.ContainsKey(HttpContext.Current.Request.RawUrl) &&
        cache[HttpContext.Current.Request.Url.AbsolutePath] < DateTime.Now)
    {
        HttpContext.Response.Current.Redirect("page_expired.aspx");
    }
}

You can additionally add a SqlDbDependency to the Cache, so that it get updated when you modify the expire dates in the Database…