Merge two xml

[Reb]

Hi

Apart from using dataset to merge 2 xml documents, is
there any other way to merge 2 similar xml documents.
Because when i get an error message when I am using
dataset to merge the xml documents.

This is the code i am using.

XmlTextReader xmlreader1 = new XmlTextReader("Menu1.xml");
XmlTextReader xmlreader2 = new XmlTextReader("Menu2.xml");

DataSet ds2 = new DataSet();
ds2.ReadXml(xmlreader2);
DataSet ds = new DataSet();
ds.ReadXml(xmlreader1);
ds.Merge(ds2);

The error is
"The table (subMenu) cannot be the child table to itself
in nested relations."

this is the sample xml document which i am using..
<Menu>
<menuItem>
<text>Menu_Welcome</text>
<subMenu>
<menuItem>
<text>Equipment Tracking</text>
<url>/IDEALview/default.aspx?_PageIndex=0</url>
</menuItem>
</subMenu>
</menuItem>
</Menu>

When i remove the submenu tag, i dont get this error. But
I am forced to use this tag/format because the server
control which i am given uses this submenu tag to identify
if it is a sub menu.

Kindly help.
Thanks
Reb