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How to determine what process has file locked

Posted on 2005-03-22
Medium Priority
Last Modified: 2012-08-14
I have an application that writes files out, and I am getting System.IO.IOException because it is in use by another process. How can I determine what process is using this file?  (a PID would be great).

Here's the current code
            Dim sr As StreamWriter = File.CreateText(_strFileName)
        catch e as Exception
        end try
Question by:lrr81765
1 Comment
LVL 12

Accepted Solution

fruhj earned 1500 total points
ID: 13603327
Do you need to do this in code or just need to figure it out once so you can shut down the other app?

If you just need to see it once, there's a few excellent utilities over at sysinternals

http://www.sysinternals.com/ntw2k/freeware/procexp.shtml (Gui utility for showing what files are opened by what pids)
http://www.sysinternals.com/ntw2k/freeware/handle.shtml  (Command line util to show what files are opened by what pids)

(you might also find filemon.exe and regmon.exe useful - they tell you in real time what files/registry keys are being accessed on your system)

if you need to do it in your own code, they've written a book under Microsoft press called Windows Internals, 4th edition: http://www.sysinternals.com/windowsinternals.shtml

- Jack

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