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Asked: 2026-05-11T08:50:01+00:00

I’ve got a strange thing happening with my app.config file. My ConnectionStrings section contains

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I’ve got a strange thing happening with my app.config file. My ConnectionStrings section contains this:

<connectionStrings>   <add name='Connection' connectionString='Data Source=TheServer;    Initial Catalog=TheDatabase;IntegratedSecurity=SSPI'     providerName='System.Data.SqlClient'/> </connectionStrings>

However, when I query the section via ConfigurationManager.ConnectionStrings[0], I get back this connection string:

Data Source=.\\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true

Where is it getting this value from?

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1 Answer

  1. It is read from machine.config, you can either make sure to clear all connection strings before adding your own:

    <connectionStrings>   <clear/>   <add name='Connection' connectionString='Data Source=TheServer;    Initial Catalog=TheDatabase;IntegratedSecurity=SSPI'     providerName='System.Data.SqlClient'/> </connectionStrings>

    Or just never reference your connection strings by indexes, use names you give them:

    ConfigurationManager.ConnectionStrings['Connection']
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