public override ErrorList Validate() { var result = new ErrorList(); result.AddRange(base.Validate()); if (Name != null) { result.AddRange(Name.Validate()); } if (HeaderElement != null) { result.AddRange(HeaderElement.Validate()); } if (TextElement != null) { result.AddRange(TextElement.Validate()); } if (Subject != null) { result.AddRange(Subject.Validate()); } if (Question != null) { Question.ForEach(elem => result.AddRange(elem.Validate())); } if (Group != null) { Group.ForEach(elem => result.AddRange(elem.Validate())); } return(result); }