Take a look at the docs on MSDN, there are examples at the bottom.
http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx
for getting a dataset from XML see this MSDN article
http://msdn.microsoft.com/en-us/library/fx29c3yd.aspx
the final part – regarding the writing back to multiple tables can be see from this walk through on MSDN
http://msdn.microsoft.com/en-us/library/4esb49b4.aspx
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solved Using C# and asp read and write xml [closed]