How do I connect to old version database in visual stadio 2015

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I debug a windows based project in visual studio2015,but face error in objet sqlconnection be open

What I have tried:

I change connection string,attachdbfilename,user instance ... but cannot conect to database and open

Posted 15-Jun-17 4:36am

Reza.kvn

Updated 15-Jun-17 7:35am

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2 solutions

Solution 2

About AttachDBFileName:

Quote:
This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.

More information here: Bad habits : Using AttachDBFileName - SQL Sentry[^]

Posted 15-Jun-17 7:35am

RickZeeland

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OriginalGriff · Accepted Answer · 2017-06-15T04:48:00

Start by not attaching databases to SQL - it's a "special" for development only, and doesn't work at all in non-Express versions of Sql Server. You should create the DB within SQL and let it manage it, not try to attach a file as needed.

Second, start with your connection string - try setting up a connection in VS with the Server Explorer pane:
1) Open Server Explorer.
2) Right click "Data connections" and select "Add connection"
3) In the dialog that follows, select your DataSource, and database, specify the security info, and press the "Test connection" button.
4) When the connection works, press "OK"
5) Highlight your database in the Server Explorer pane, and look at the Properties pane. A working example of the connection string will be shown, which you can copy and paste into your app or config file.

Until you have that working, your C# or VB based code is never going to work.