Application has generated an exception that could not be handled.

I have a program which reads and reformats text files.  It's giving this message:
Application has generated an exception that could not be handled.  Process ID=(4004), Thread ID=0x328(808)
It is quite long running and there could be multiple instances running at the same time.  However they would not be using the same files at the same time.
What could be causing this error?
I'm using C#.net windows forms with visual Studio 2008.
AlHal2Asked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
unless you add error handling into your application to give a more precise error, it will be impossible to help you on this one.

the error handling should then indicate what is is doing, which file it is handling etc.
the more precise the error handling is implemented, the simpler you can do debugging later.
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
error handling is done with try catch
https://msdn.microsoft.com/en-us/library/0yd65esw.aspx
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AndyAinscowFreelance programmer / ConsultantCommented:
>>What could be causing this error?
Basically an error somewhere in your code.  As Guy says you will need to do a lot more work to track it down by adding (more) error handling code.

Is there any more information in the windows event logs ?  (Long shot but there might be something there to help locate where your code might be failing).
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Easwaran ParamasivamCommented:
Additionally, you have to implement Global exception handling as well. In case, any exceptions missed to capture in application, it would be trapped here.

http://www.csharp-examples.net/catching-unhandled-exceptions/

Log the exception's Stack Trace using blow code.

var l_CurrentStack = new System.Diagnostics.StackTrace(true);
    return l_CurrentStack.ToString();

HTH.
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AlHal2Author Commented:
thanks.
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