title: What is the difference between the properties Keys and AllKeys on a NameValueCollection?
body: <p>System.Collections.Specialized.NameObjectCollectionBase has two similar properties:</p>
  
  <pre><code>  string[] AllKeys
    NameObjectCollectionBase.KeyCollection Keys
  </code></pre>
  
  <p>Do they provide different sets of data?  When would I want to use one over the other?</p>