SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified

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i am try to add database .mdf file in VS2011 then this error occur and he can't add .mdf file

" A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) "

if i open any other project in the existence database the same error occur.

anybody tell me.

Posted 5-Aug-12 11:04am

raajaakhan

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[no name] 5-Aug-12 17:23pm

And? Is your SQL server connected to a network? Has it been configured? Is it actually running? Can you connect with SSMS?

raajaakhan 6-Aug-12 13:43pm

i'm creating a windows form application.

[no name] 6-Aug-12 14:01pm

Okay good... what does that have to do with your error message?

2 solutions

Solution 2

An MDF file is an SQL Server database file, and has nothing to do with Visual Studio. You should use SQL Management Studio (also based on Visual Studio) to attach the database file to the SQL server. Of course you need an SQL server also.

Posted 5-Aug-12 11:23am

Zoltán Zörgő

Updated 5-Aug-12 11:25am

v2

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Volynsky Alex · Accepted Answer · 2012-08-05T12:32:00

Try read it:
http://www.sqlmusings.com/2009/03/11/resolving-a-network-related-or-instance-specific-error-occurred-while-establishing-a-connection-to-sql-server/[^]
http://stackoverflow.com/questions/1391503/a-network-related-or-instance-specific-error-occurred-while-establishing-a-conne[^]
http://stackoverflow.com/questions/4737948/a-network-related-or-instance-specific-error-occurred-while-establishing-a-conne[^]
http://stackoverflow.com/questions/9998866/sql-network-interfaces-error-26-but-not-connection-string-is-it-entity-framew[^]
http://www.sqlservercentral.com/Forums/Topic1269164-391-1.aspx[^]
http://www.sqlservercentral.com/Forums/Topic1269164-391-1.aspx[^]
http://social.msdn.microsoft.com/Forums/en-US/sqlexpress/thread/8cdc71eb-6929-4ae8-a5a8-c1f461bd61b4/[^]
http://www.sswug.org/articlesection/default.aspx?TargetID=44331[^]