Custom XML format in XML file created by WriteXML method

Hello all
I have a similar problem.
In my ASP.NET 3.5 webpage I need to convert a Datatable
in a XML file and save it on the C:\ root of the users.

My datatable has an output like this (from my SELECT clause in the database):

Title1    Title2        up_bde    Value
RIC_MGP    STIME-MGP    UP_1    70.68
RIC_MGP    STIME-MGP    UP_2    3.82
RIC_MGP    STIME-MGP    UP_3    0.5
RIC_MI    STIME-MI    UP_1    0.9
RIC_MI    STIME-MI    UP_2    69.2
RIC_MI    STIME-MI    UP_3    47.03
....

At this moment I'm using the WriteXML method of the Dataset class, like:

// Writing XML file
var dsExportSAP = new DataSet();
dsExportSAP.Tables.Add(result);
dsExportSAP.WriteXml("C:\\Temp\\testExport.xml");  

This works fine, but I need a particular format for the output file.
This is the desidered format (for the first record of my datatable).

<CVRList><Title1 Title="RIC-MGP"><Title2 Title="STIME-MGP"><UP Name="UP_1">70.68</UP></Title2></Title1>
....

Instead I got this XML file:

<?xml version="1.0" standalone="yes"?><NewDataSet><Table1><Title1>RIC_MGP</Title1><Title2>STIME-MGP</Title2><up_bde>UP_1</up_bde><Value>2689370.68326</Value></Table1>
  ...

How can I force this particular XML format?

Thanks a lot in advance.


Luigi