public void When(UserAttachedToRegistration e)
 {
     if (null == FirstUser)
     {
         FirstUser = new User(e.UserId, e.UserDisplay, e.Token);
     }
 }
 public void When(UserAttachedToRegistration e)
 {
     if (null == FirstUser)
     {
         FirstUser = new User(e.UserId, e.UserDisplay, e.Token);
     }
 }