title: The type or namespace name 'Practices' does not exist in the namespace 'Microsoft'
body: <p>I am using Microsoft Visual Studio 2005 for c#
  I have the following namespace on my code</p>
  
  <pre><code>using Microsoft.Practices.EnterpriseLibrary;
  using Microsoft.Practices.EnterpriseLibrary.AppSettings;
  using Microsoft.Practices.EnterpriseLibrary.Data;
  </code></pre>
  
  <p>and I keep on getting this error:</p>
  
  <p>-The type or namespace name 'Practices' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)    </p>
  
  <p>What should I do?</p>
  
  <p>Thanks in advance. :)</p>