title: An entity object cannot be referenced by multiple instances of IEntityChangeTracker
body: <p>I am getting the following error while trying to update an entity,
  'An entity object cannot be referenced by multiple instances of IEntityChangeTracker'
  The code runs as,</p>
  
  <pre><code>        dbUsers.Users.MergeOption = MergeOption.NoTracking;
          dbUsers.Users.Attach(user);
          dbUsers.ObjectStateManager.ChangeObjectState(user, System.Data.EntityState.Modified);
          dbUsers.SaveChanges();
  </code></pre>
  
  <p>Please help me to get rid of it.</p>