问如何在c#中通过oracle命令创建xml

EN

 using (OracleConnection con = new OracleConnection(ConnectionString))
    {
        con.Open();
     OracleCommand command = new OracleCommand("select firstname,secondname,lastname,
age,gender from Members", con))
     OracleDataReader rdr = command.ExecuteReader();
    while(rdr.Read())
    {
    .....
    } 

    }

<Root>
<Member>
<Name>
  <firstname>firstname1<firstname>
  <secondname>secondname1<secondname>
  <lastname>lastname<lastname>
</Name>
<age>45</age>
<gender>M</gender>
</Member>
<Member>
<Name>
  <firstname>firstname2<firstname>
  <secondname>secondname2<secondname>
  <lastname>lastname2<lastname>
</Name>
<age>25</age>
<gender>F</gender>
</Member>
</Root>