Generate and read XML file

<List>
   <Person Age="40">
       <FirstName>John</FirstName>
       <LastName>Brown</LastName>
       <Children>
           <Son Age="3">
                <Name>Bill</Name>
           </Son>
           <Son Age="5">
                <Name>Jerry</Name>
           </Son>
       </Children>
   </Person>
   <Person Age="35">
       <FirstName>Tom</FirstName>
       <LastName>Robbins</LastName>
       <Children>
           <Son Age="2">
                <Name>Michael</Name>
           </Son>
           <Daughter Age="5">
                <Name>Mary</Name>
           </Daughter>
       </Children>
   </Person>
</List>

I need code to generate this XML using XMLDocument and save it to file. Then I need to load file to XMLDocument and enumerate all nodes.