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Microsoft Jet Database Engine cannot open file ",

Posted on 2011-09-15
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Last Modified: 2012-06-21
I have a Windows form application installed on my development server. When I run the exe(using a network path) from my machine(Windows 7) it runs fine. However when another user(running Windows XP) runs it from his machine he gets the following error
Microsoft Jet Database Engine cannot open file ", It is already opened exclusively by another user or you need permission to view this data.
I have checked and the msjet40.dll exists on both machines.

Any ideas why this could be happening,
Thanks,
Aditya
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Question by:pmac38CDS
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Expert Comment

by:Easwaran Paramasivam
ID: 36547948
Well. You are running the exe. Please Stop using the EXE or kill the process from your task manage. So that other person could open the same.
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Author Comment

by:pmac38CDS
ID: 36548565
The XP  user gets the same error when he tries it even though I have stopped using the exe.

Thanks,
Aditya
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LVL 28

Expert Comment

by:strickdd
ID: 36549070
Since you are running from a windows share, it means that the database is being shared by everyone running the application. If you turn off the Windows 7 box, it will force the connection to close and the XP machine should be able to run the app and connect to the DB.

If this does work, and you need the application to run on both computer simultaneously, it means that the application has an open connection to the database that needs to be closed in order to allow another instance to connect. Check the code and make sure to use the following structure:

1. Open Connection
2. Execute Query
3. Close Connection
4. Dispose of objects (optional)
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Author Comment

by:pmac38CDS
ID: 36550826
I am opening and closing the connection everytime the  Jet Engine is called.

Thanks,
Aditya
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LVL 28

Expert Comment

by:strickdd
ID: 36550876
Then I would recommend finding out what process has a lock on the file (http://windowsxp.mvps.org/processlock.htm).

Did you try restarting the Windows 7 machine and using JUST the XP machine?
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Accepted Solution

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pmac38CDS earned 0 total points
ID: 36556271
I got around the problem by not using the Jet Engine.
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Author Closing Comment

by:pmac38CDS
ID: 36585501
I got around the problem by not using the Jet Engine.

Thanks,
Aditya
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