XDT Transform samples

sample.config

<configuration>
    <connectionStrings>
        <clear/>
        <add name="Default" connectionString="Data Source=localhost;Initial Catalog=Sample01;Integrated Security=True;" />
    </connectionStrings>
    
    <appSettings>
        <add key="contactEmail" value="contact@demo.example.com"/>
        <add key="siteUrl" value="http://demo.example.com"/>
    </appSettings>
    
</configuration>

sample.transform.config

<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
    <connectionStrings>
        <clear/>
        <add name="Default" connectionString="Data Source=NOT-localhost;Initial Catalog=Sample01;Integrated Security=True;" 
             xdt:Locator="Match(name)" xdt:Transform="Replace"/>
    </connectionStrings>

    <appSettings>
        <add key="contactEmail" value="contact@example.com" xdt:Locator="Match(key)" xdt:Transform="Replace"/>
        <add key="siteUrl" value="http://example.com" xdt:Locator="Match(key)" xdt:Transform="Replace"/>
    </appSettings>

</configuration>