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Asked: 2026-05-27T17:59:29+00:00

I have a web application in VS2010 with a web.config like this: … <configuration>

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I have a web application in VS2010 with a web.config like this:

...
<configuration>
  <connectionStrings>
    <add name="ApplicationServices"
         connectionString="data source=MyProdDb;Initial Catalog=MyCat;User Id=MyUser;Password=MyPass;"
         providerName="System.Data.SqlClient" /> 
  </connectionStrings>
...

and a Web.Debug.config like this:

...
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
    <connectionStrings>
        <add name="ApplicationServices"
          connectionString="data source=MyDevDb;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true"
          xdt:Transform="SetAttributes" xdt:Locator="Match(name)"/>
    </connectionStrings>
...

The project is set to create a Debug build, and when I run it in the debugger, I get MyProdDb rather than MyDevDb

What am I missing?

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1 Answer

  1. Editorial Team

    As people have said the web.config versions only get applied at publish (MSDeploy) time. The normal way you would do things is to have your ‘Debug’ config in the actual web.config file and make changes to that for each of the deployment scenarios you have.

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