XML : Extra node in Serialize object to XML

I have following object model

  public class BIDbObject  {      // some methods and properties here         public BIDbColumns DbColumns { get; set; }  }    [XmlRoot("root")]  public class BIDbObjects  {      // some methods and properties here         [XmlArray("dbobjects")]      [XmlArrayItem("dbobject")]      public List<BIDbObject> DbObjects { get; set; }  }    public class BIDbColumn  {      // some methods and properties here         [XmlAttribute("name")]      public string ColumnName { get; set; }  }    public class BIDbColumns  {      // some methods and properties here         [XmlArray("columns")]      [XmlArrayItem("column")]      public List<BIDbColumn> DbColumns { get; set; }  }    

I serialize BIDbObjects class and get below XML

  <root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">    <dbobjects>      <dbobject database="Crius" schema="dbo" name="rptAgedPhase3ColLoginReceived" type="T">        <DbColumns>          <columns>            <column name="LoanNum" />            <column name="BACLOAN_ID" />            <column name="Unfunded" />            <column name="RoutingType" />            <column name="DivAbbrev" />            <column name="BranchNum" />            <column name="BranchSatelliteNum" />            <column name="ClosedCd" />            <column name="AS400PhaseCd" />            <column name="RgnNum" />            <column name="ReceivedDt" />            <column name="TreasBankPortfolioFlagBit" />            <column name="TreasBankDestType" />            <column name="TreasuryBankDestTypeDesc" />          </columns>        </DbColumns>      </dbobject>    

I need to get rid of DbColumns in the XML

  <dbobject database="Crius" schema="dbo" name="rptAgedPhase3ColLoginReceived" type="T">    <DbColumns>  <---- this one      <columns>      .....    

Thanks for help!