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Please solve my problem
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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

My pcname:bhargava-f794cb
Instace name:MSSQLSERVER

what is the datasource name
SqlConnection conn = new SqlConnection("Data Source=MSSQLSERVER;Initial Catalog=OnlineLibrary;Integrated Security=True");
Updated 18-Nov-17 17:28pm
Dave Kreskowiak 3-Mar-12 0:12am    
Which edition of SQL Server are you using?? Express or what??

SqlConnection conn = new SqlConnection("Data Source=bhargava-f794cb\SQLEXPRESS;Initial Catalog=OnlineLibrary;Integrated Security=True");
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Member 8634349 3-Mar-12 10:21am    
I TRY this but it shown error:

"Unrecognise escape sequence"
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.
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Member 8634349 3-Mar-12 11:14am    

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