title: SessionBag missing in servicestack version 4.5.0
body: <p>I am new to servicestack and using servicestack version 4.5.0.
  With reference to the <a href="https://stackoverflow.com/questions/31363927/servicestack-session-missing">ServiceStack &#39;session&#39; missing?</a>
  <strong>Where can I find this base.SessionBag property</strong> ? with base keyword I am getting
  <a href="https://i.stack.imgur.com/Ckkzw.png" rel="nofollow noreferrer">these intellisense</a></p>
  <p>please help me.</p>
  <p>what does this line means:
  <strong>Inside a Service the dynamic untyped Session Bag was renamed to base.SessionBag.</strong></p>
  <p>what does this line means:
  <strong>Inside a Service the dynamic untyped Session Bag was renamed to base.SessionBag.</strong>
  when I write base. I find following intellisense</p>
  <pre><code>base.Session //-- Property Method   
  base.SaveSession //--- Extension  
  base.SessionAs&lt;&gt;  
  base.SessionFactory //-- Property Method   
  
  public class EntryService : Service
  {
      public object Post(Entry request)
      {
          var date = request.Time.Date;
          var trackedData = (TrackedData)Session= date.ToString();
          if(trackedData == null)
              trackedData = new TrackedData { Goal = 300 };
  
           trackedData.Total += request.Amount;
          Session[date.ToString()] = trackedData;
  
          return new EntryResponse { Id = 1};
      }
  
  }
  </code></pre>
  <p>i want like this</p>
  <pre><code>  Session[date.ToString()] = trackedData;
  </code></pre>
  <p>but an error occurs  <strong>Cannot apply indexing with [] to an expression of type ServiceStack.CacheAccess.ISession</strong></p>