Web.config Transformations

Web.config.release

/* Original */
<appSettings>
  <add key="MyUsername" value="hello-user"/>
  <add key="MyPassword" value="yadayadayada"/>
</appSettings>

/* Overload */
<appSettings>
  <add key="MyPassword" value="xxx......" xdt:Transform="Replace" xdt:Locator="Match(key)" />
</appSettings>

/*
 * Final
 */

<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
  <applicationSettings>
    <MyApplication.DemoApp.Settings>
      <setting name="MyUsername" serializeAs="String"  xdt:Transform="Replace" xdt:Locator="Match(name)">
        <value>hello-world</value>
      </setting>