title: SSRS how to access Shared DataSet values in expression
body: <p>I need to set the connection string somewhere in one place in SSRS project in order to use it in Data Sources across all the reports. As SSRS doesn't support project params it's recommended to create Shared DataSet instead, e. g. HostParam.rds</p>
  <pre><code>SELECT 'localhost' AS GlobalParameter
  </code></pre>
  <p>The question is how to access it further in expression in Data Source connection string</p>
  <pre><code>=&quot;Data Source=&quot; + HostParam.GlobalParameter + &quot;;Initial Catalog=xxx&quot;
  </code></pre>
  <p>gives an error 'HostParam' is not declared</p>