title: How to get the smallest date from a list of objects with a date?
body: <p>I created a simple class that represents a project:</p>
  
  <pre><code>public class EntityAuftrag
  {
      public string cis_auftrag { get; set; }
      public string bezeich { get; set; }
      public DateTime? dStart { get; set; }
      public DateTime? dEnd { get; set; }
      public decimal? aufstunde { get; set; }
      public int id_auftrag { get; set; }
      public string barcolor { get; set; }
  }
  </code></pre>
  
  <p>Now I have a list of these. I want to extract the smallest date, how do I do that?</p>