 <p>You can use the <code>Insert</code> transformation:</p> <pre><code> &lt;resizer&gt; &lt;plugins&gt; &lt;add name="AzureReader" connectionString="DataConnectionString" xdt:Transform="Insert" /&gt; &lt;/plugins&gt; &lt;/resizer&gt; </code></pre> <p><a href="http://msdn.microsoft.com/en-us/library/dd465326.aspx">Web.config Transformation Syntax for Web Application Project Deployment</a></p>