public string ToXmlString() { string body = string.Format(head, _companyId); if (_year != null) { body = body + String.Format(yearBody, _year.Value); } body = body + string.Format(symbolBody, _symbolName); if (_description != null) { body = body + String.Format(descriptionBody, _description); } body = body + _lob.ToXmlString(); body = body + _proj.ToXmlParameterString(); body = body + _mpk.ToXmlString(); body = body + bodyEnd; return(body); }