title: strange variable structure I never seen before,
body: <p>Can anybody explain this var statement in C#? I can not git this identifier what it meant to be? <strong>(availableItems, preorderItems)</strong>  </p>
  
  <pre><code>var (availableItems, preorderItems) = await order.GetDifferentiatedProductDataAsync&lt;OrderItemData&gt;(_sort, _products);
  </code></pre>