.NET Runtime error

[raagzcd]

Hi,

I have deployed an ASP.NET application on windows 2003 server.
It uses windows authentication .In the code i am using the following
code to identify the corpid
of the logged in user.

string user=User.Identity.Name.ToString();

I am storing the UserID and other credentials in session and using them
in other pages.

when i am accessing the application on windows 2003 server , sometimes
(not always) i
get the windows authentication pop [the pop expects userid and
password] and after i
enter the userid and password i get the following error in the event
log.

Event Log:
Event Type: Error
Event Source: .NET Runtime
Event Category: None
Event ID: 0
Date: 8/2/2005
Time: 12:14:42 PM
User: N/A
Computer: mycomputername
Description:

The description for Event ID ( 0 ) in Source ( .NET Runtime ) cannot be
found. The local computer may not have the necessary registry
information or message DLL files to display messages from a remote
computer. You may be able to use the /AUXSOURCE= flag to retrieve this
description; see Help and Support for details. The following
information is part of the event: .NET Runtime version 1.1.4322.573-
w3wp.exe - Common Language Runtime Debugging Services: Application has
generated an exception that could not be handled.

Process id=0x1d0 (464), Thread id=0xd6c (3436).

Click OK to terminate the application.
Click CANCEL to debug the application..

The error in the event log entry is very generic and i am not able to
identify the cause of error.

Any idea how to resolve such issues.

Regards
Raagz