title: EF 6 - How to correctly perform parallel queries
body: <p>When creating a report I have to execute 3 queries that involve separated entities of the same context. Because they are quite heavy ones I decided to use the <code>.ToListAsync();</code> in order to have them run in parallel, but, to my surprise, I get a exception out of it...</p>
  
  <p>What is the correct way to perform queries in parallel using EF 6? Should I manually start new Tasks?</p>
  
  <p><strong>Edit 1</strong><br>
  The code is basically</p>
  
  <pre><code>using(var MyCtx = new MyCtx())
  {
        var r1 = MyCtx.E1.Where(bla bla bla).ToListAsync();
        var r2 = MyCtx.E2.Where(ble ble ble).ToListAsync();
        var r3 = MyCtx.E3.Where(ble ble ble).ToListAsync();
        Task.WhenAll(r1,r2,r3);
        DoSomething(r1.Result, r2.Result, r3.Result);
  }
  </code></pre>