title: Unable to use C# ConfigurationManager
body: <p>I have the following code:</p>
  
  <pre><code>using System.Configuration;
  
  namespace test
  {
    public partial class MyService : ServiceBase
    {
      public  static ReadConnectionStrings()
      {                        
        ConnectionStringSettingsCollection connections =
            ConfigurationManager.ConnectionStrings;
  </code></pre>
  
  <p>However, it doesn’t recognise ConfigurationManager.   I took this code directly from <a href="http://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager%28v=VS.90%29.aspx" rel="noreferrer">here</a></p>
  
  <p>So I’m clearly missing something, but can’t identify what.</p>