public override int GetHashCode()
 {
     unchecked
     {
         int hashCode = _meetingDateTime.GetHashCode();
         hashCode = (hashCode * 397) ^ SubmissionTime.GetHashCode();
         hashCode = (hashCode * 397) ^ (EmployeeId != null ? EmployeeId.GetHashCode() : 0);
         hashCode = (hashCode * 397) ^ MeetingDuration;
         return(hashCode);
     }
 }