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Editorial Team
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Asked: 2026-05-26T18:43:55+00:00

I developed a small project in visual studio 2010. In my project I attach

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I developed a small project in visual studio 2010. In my project I attach a service-based database named database1.mdf.

My connectionString is :

Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True;User Instance=True

It works fine on my developer pc but it throws an exception on a client’s pc.

Exception is :

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)

I don’t understand what is happening.

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1 Answer

  1. Editorial Team

    Two things need to occur before you can connect to a SQL Server Express database.

    1. SQL Server Express must be installed on the target server. Having the file present isn’t sufficient. (This is what the error you’re experiencing likely means).

    2. The path to your database file should be an absolute path to rule out the possibility of a file location error.

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