XML & XSLT

[asraj16]

Hi,
I am generating XML randomly and assigning this XML to a string variable. I need to merge the XMLs one by one. For Example I get the following XML in the first iteration.

<?XML version="1.0"?>
<test>
<test1>
<test2></test2>
<test3></test3>
</test1>
</test>

I am assigning this XML to a string variable.
In the Second iteration, I get the same XML. I need to merge these XMLs to the first XML. How to do that? Is there any way to do this in .NET technologies?

Thanks