Hi,

I am trying to set up fragment caching by using the VaryByControl attribute
in a page directive in an ascx file.  At the same time I also need to set
the output response of the user control to be dependent on a file so that I
can invalidate the cache when the content of the file has been changed even
before the cache expired. So I set up file dependency to the output response
of the user control in the Page_Load event in the ascx file. The
VaryByControl works fine and it caches a version of the user control when
different values of the controls specified in the VaryByControl attribute
are set. However, the file dependency did not work. When the file got
removed or modified it used the cache version of the user control (if it
existed before) instead of creating a new instance of user control. Can the
VaryByControl in page directive and file dependency work together in an ascx
file? If not, is there a way to programmatically do what VaryByControl is
supposed to do in the code-behind?

Here is my page directive in the ascx file:

<%@ OutputCache duration="300" VaryByControl="ctl1,ctl2, ctl3" %>

Here is the code I used to set the file dependency to the output response in
the Page_Load() event in the ascx file:

Page.Response.AddFileDependency("C:\\testfile.txt");

thanks in advance.