hi,

I'm experiencing a weird problem. I am using a TimerCallback in my ASP.NET
application. This callback function will access the cache and I'm using
HttpRuntime.Cache to intert an item to the cache with a file dependecy.

Every now and then the cache item requested is Null and I can't seem to work
out when it happens. Are there any limitation on HttpRuntime vs.
HttpContext.Current cache? We've been using HttpContext.Current for quite
some time without any problems but when switching to HttpRuntime the items
don't stick in the cache anymore.

Thanks,
Manso

the two both map to the same object. what most likely is happening is that
your cache is beign scavenged by the OS. There's no guarantee made by the
run-time that your cache objects will be available by the way so you should
not code with that assumption. Instead, you should test the cache before u
use it and replenish it as needed.

--
Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The Microsoft Office Web Components Black Book with .NET
Now Available @ www.lulu.com/owc
Forth-coming VSTO.NET - Wrox/Wiley 2006
-------------------------------------------------------



"Manso" <Manso (AT) discussions (DOT) microsoft.com> wrote

Thanks for your reply.

There is a difference on how the two work. I have an isolated case where I
simply changed from HttpContext.Current.Cache to HttpRuntime.Cache with a
file dependency and the one with HttpRuntime gets reset. Not all the time but
sporadically. The code is located in a separate assembly being referenced
from a web project. When I change back it works well again.

Does anyone know how we can troubleshoot this? I'm starting to miss the old
VB function "Add watch and break when variable X changes"...

Thanks,
Manso
"Alvin Bruney - ASP.NET MVP" wrote:

You shouldn't. .NET has more powerful monitoring tools. One simple approach
is to set a conditional breakpoint on th value of the cache object. Another
approach is to set the break on all exceptions. If you can reproduce this at
will, i'd be interested in looking at some code.

--
Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The Microsoft Office Web Components Black Book with .NET
Now Available @ www.lulu.com/owc
Forth-coming VSTO.NET - Wrox/Wiley 2006
-------------------------------------------------------



"Manso" <Manso (AT) discussions (DOT) microsoft.com> wrote

I posted this on a separate thread becuase it's not related to HttpRuntime

http://msdn.microsoft.com/newsgroups...d95&sloc=en-us

Thanks for your help.

- Manso

"Alvin Bruney - ASP.NET MVP" wrote: