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Changing Connection String dynamically

Posted on 2009-03-31
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Last Modified: 2012-05-06
I am converting a VB6 app to .NET. In VB6, the connection string was set in code. The user could open a different database using an Open Dialog box. After selecting the file, the new path and name was saved for that and all future connections.

I don't know how to handle this change in .NET. I'm setting up data sources for most forms. When I create the data source, the Data Source Configuration Wizard asks for a connection string. Apparently, this gets saved in some configuration file. This would be fine if the database name and path were identical for every user, but I don't want to be forced into this scenario.

How can I give the user a dialog box to select a file and then, each time they launch the program, it will use that for the connection? I seemed to have read the connection string is read only.

Thanks.
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Question by:LeeLiam
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Expert Comment

by:jpaulino
ID: 24032686
Hi,
 You can save that configuration into settings.
http://www.emoreau.com/Entries/Articles/2007/03/AppSettings-revisited.aspx 
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Author Comment

by:LeeLiam
ID: 24033300
Thank you. That is an excellent article and it will take me some time to fully digest it.

In the meantime, can I place a line of code like:

Me.TableAdapter.Connection.ConnectionString = OleConn.ConnectionString

before using the table adapter? Will this override the stored connection string?

Thanks.
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Accepted Solution

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jpaulino earned 500 total points
ID: 24033345
Yes it will.
You save your new connection string in the settings and then you assing that to your datatable (on form load event for example)
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Author Comment

by:LeeLiam
ID: 24033545
Perfect.

Thanks for your help.

(I assume you meant 'passing'. :) )
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LVL 48

Expert Comment

by:jpaulino
ID: 24033567
LOL, it was a typo :)
Glad I could help!
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