title: Getting the connectionstring in .net 4
body: <p>I want to get a connection string from the <code>app.config</code> file.</p>
  <p><code>connectionString = System.Configuration.ConfigurationSettings.AppSettings[&quot;DBEntities&quot;];</code></p>
  <p>But it doesn't work. It's empty.</p>
  <p>I cannot access the <code>System.Configuration.ConfigurationManager</code> because it's .NET 4.
  How can I get my connection string from the <code>app.config</code>?</p>