protected void Page_Load(object sender, EventArgs e)
{
    Response.AddCacheItemDependency("ProcessIntensiveReport");

    // Set additional properties to enable caching.
    Response.Cache.SetExpires(DateTime.Now.AddSeconds(60));
    Response.Cache.SetCacheability(HttpCacheability.Public);
    Response.Cache.SetValidUntilExpires(true);
}

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Response.AddCacheItemDependency("ProcessIntensiveReport")

    ' Set additional properties to enable caching.
    Response.Cache.SetExpires(DateTime.Now.AddSeconds(60))
    Response.Cache.SetCacheability(HttpCacheability.Public)
    Response.Cache.SetValidUntilExpires(True)
End Sub