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I installed Sql Server 2008 R2 in win 7 32bit. It installed correctly and made a database. I opened visual studio 2010 and wrote a code that it connects to Sql server.
cn = new SqlConnection(); 
cn.ConnectionString = Data Source=(local); 
Initial Catalog=XXX_amlak; 
User ID=sa; password=XXX; 

but it has this error.
SQLException was unhandled 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)

Visual Studio has installed SQL Express automatically.I disable my Internet security.
Updated 19-Oct-12 10:18am

1 solution

You have either one of two situations:
1) Your connection string is kaput and needs to be fixed (This is my assumption, as "(local)" is not likely a valid instance name. This value needs to reflect the proper instance name that you use when you logon using Management Studio. Usually something like 'localhost/INSTANCE', or 'MACHINENAME/INSTANCE'.
2) Your SQL server is not accepting remote connections.
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suraty 20-Oct-12 13:18pm    
I am trying to connect to SQL Server Management Studio.

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