Re: Could not load file or assembly 'App_Web...'

Yea, I read several posts from people who said they had obtained and
were going to install the Hotfix, and in almost every case there would
be a follow up post indicating that the problem wasn't fixed
post-hotfix.

One tool that you can use to identify assembly versions is ILDASM.exe
which comes w/ VS.NET.  You can use this tool in 2 ways.  First you can
just try to open the assembly.  The ILDASM tool that comes with 1.x
won't open a 2.x assembly (however the 2.x version will open a 1.x
assembly).  Once you have the assembly open, you can double click on the
Manifest icon.  The first line of the manifest will give you the
Framework version of the assembly.  It should look something like:

// Metadata version: v2.0.50727

Good Luck
-Mark


-----Original Message-----
From: Discussion of building .NET applications targeted for the Web
[mailto:[email protected]] On Behalf Of Simpson, Nick
Sent: Wednesday, February 14, 2007 11:22 AM
To: [email protected]
Subject: Re: [DOTNET-WEB] Could not load file or assembly 'App_Web...'

Thanks Mark. I read somewhere that the hotfix for KBID 915782 was part
of
VS2005 SP1. I installed VS2005 SP1 and it didn't fix the problem.

Interesting about the reference to 1.x assemblies. We reference a few
third
party assemblies and a few web services. Do web services count? Also -
how
can you tell in a really easy non-programmatic way what version of .NET
an
assembly was built in? I'm sure this is easy, i just don't know. I used
Reflector but couldn't see this information, ditto for file system
properties.

Nick

-----Original Message-----
From: Discussion of building .NET applications targeted for the Web
[mailto:[email protected]] On Behalf Of Mark Kucera
Sent: 09 February 2007 19:16
To: [email protected]
Subject: Re: [DOTNET-WEB] Could not load file or assembly 'App_Web...'

We had this same problem.  And it was always a real pain.  The problem
would
always occur at the most inopportune times, and often we weren't able to
recompile and deploy because it would be publishing code that wasn't
finished yet.  We actually figured out that you can basically stop the
site,
and go into the temporary asp.net files
c:\windows\microsoft.net\framework\.... and delete the cache and then
the
site would come back up and work again for a couple days or hours. There
was
no logic to when it would die the next time.  MS has a KB that is
supposed
to fix this error...

http://support.microsoft.com/kb/915782/en-us

however I had read on several forum posts about people who installed
this
and still experienced the problem afterwards.  We installed this Hotfix
and
continued to experience the problem.

Ironically I posted a message to this forum a couple months ago w/ this
problem and 1 user wrote back to check your application and see if you
might
be referencing any 1.x assemblies in your 2.x application.  Sure enough
I
had 1 1.1 assembly that was being referenced, and after I rewrote it
into
2.0 (Thank You Reflector.exe) the problem went away and hasn't happened
since.  I'd urge you to take a look and see if that might be your
problem as
well.

Good Luck!
MK


-----Original Message-----
From: Discussion of building .NET applications targeted for the Web
[mailto:[email protected]] On Behalf Of Simpson, Nick
Sent: Friday, February 09, 2007 11:13 AM
To: [email protected]
Subject: Re: [DOTNET-WEB] Could not load file or assembly 'App_Web...'

One error in my post. I installed Visual Studio 2005 SP1 not SP2.

-----Original Message-----
From: Discussion of building .NET applications targeted for the Web
[mailto:[email protected]] On Behalf Of Simpson, Nick
Sent: 09 February 2007 15:32
To: [email protected]
Subject: [DOTNET-WEB] Could not load file or assembly 'App_Web...'

Hi Guys,

From time to time we get a fairly serious exception on our site along
the
lines of the following:

"Could not load file or assembly 'App_Web_gvvevrsq, Version=0.0.0.0,
Culture=neutral, PublicKeyToken=null' or one of its dependencies. The
system
cannot find the file specified."

The consequences of this are that a great portion of our site simply
throws
this exception (System.IO.FileNotFoundException) and ceases to function
-
bad!

The fix for this is to recompile the application - a real pain in the
butt
if it happens at midnight. Also - although loads of posts out there
happily
suggest different ways of achieving a fix once the problem happens,
practically none of them are any good on how to stop it ever happening
in
the first place. Links to a few of these posts follow:

http://forums.asp.net/thread/1230276.aspx
http://forums.asp.net/thread/1271201.aspx

Should give you some idea of the sort of confusion that exists out there
on
this. One of the solutions suggested out there was to install Visual
Studio
2005 SP2. I have done so. No fix. The problem still occurs.

The circumstances under which this problem occurs in my particular case
are:

 - A non-precompiled release build with pdbs is built to our server.
 - Once the app is running we need to update an aspx or ascx file so we
copy
this to our server.
 - We then sometimes get a "could not load type exception".
 - We take our app off load balancing so no users are on it anymore.
 - We recycle the app to try and clear this but then the "Could not load
file or assembly.." problem happens.

Any ideas? Some people out there have suggested that this only happens
for
pages that use master pages with nested user controls. Our site does
this so
could be a pointer. However my most recent thoughts have turned to
getting a
better understanding of the compilation model in ASP.NET 2.0 and seeing
if a
pre-compiled no-pdb release build works via the publish function in
VS.NET
2005. Maybe this problem never happens during a pre-compiled build.

I read the following article to help me understand the new compilation
model. Any other articles out there?
http://odetocode.com/Blogs/scott/archive/2005/11/15/2464.aspx

But i'm not quite yet at understanding how to stop this ever happening
again. Any ideas?

Nick

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