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Unexpected error with Database connection in VB.Net

Cookie_Crum asked
Medium Priority
Last Modified: 2010-04-23
I have a VB.Net program that is the front end for a Access databse. I am now trying to deploy the program
and so have moved the database into the same folder as the project so that it can find the database. However when I
changed the connection settings to simply "Database.mdb" and ran the program I got the following error message:

An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in system.data.dll

What am I doing wrong?

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Firstly, your connection string shoud still say "Provider=...." and you have simply removed the path within the Data Source setting.

Next, maybe just terminology, but you have made sure the .EXE (or .DLL) is in the same folder as the database rather than the project (.proj)

You are running this on a client operating system with the .Net framework / MDAC installed ?

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Not 100% sure I've read you correctly but I checked the connection in the server explorer and it still reads "Provider =..." the only thing I changed
was the settings within OleDbDataAdapter. By ran the project I don't mean when the project was installed but when I ran the project within Visual Studio
(by pressing F5).

The machine I was running the program on had the .Net framwork installed, not sure what MDAC is!
Carl TawnSenior Systems and Integration Developer

If you don't specify the full path to the DB then it is assumed to be in the build folder. If running under the debugger, as you are, the DB will need to be in the "YourProject\Bin\Debug" folder rather than the project folder.
carl is right and that's what I was trying to get to... i.e. the current running directory is probably not what you think it is
Most Valuable Expert 2012
Top Expert 2008

If you need a more explicit exception message, wrap the code in a Try...Catch and read the exception stack:


Catch ex As Exception


End Try



Thanks!! fixed that problem nicely, just one more thing quickly, when the program is compiled during the creation of the setup file will
it recognise the database will in the Bin folder and compile that aswell? Or does it have to be in the main folder?
It won't automatically include the database within the setup project. You need to add this as a file and will therefore give it a path to pull in from when the setup project is compiled.


So it will be enough to just include the file within the application folder?
Yes, you can add the file from the application folder to the setup project, then make sure that the EXE and MDB files will both be installed in the same destination library then you should be okay
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