Pivot datatable for GridView and Update

Hello, I have seen several articles on Pivoting data in a datatable to bind to a data grid.  Im using the one referenced in this link:

http://geekswithblogs.net/dotNETvinz/archive/2009/05/10/pivot-data-in-gridview---a-generic-pivot-method-with.aspx

I have the 2 datatables as in the example.

The original normalized version 'dt' with a sqldataadapter.
and the pivoted version 'pivotedTable' as the datasource for the gridview.

I would like to save the data modified in the gridview back to the database in its normalize form.  Possibly using the 'dt' datatable and dataadapter.  

My thoughts are:
use 'getchanges' from pivotedTable:

        Dim changedRecords As System.Data.DataTable
        changedRecords = dt.GetChanges

Then use 'changedrecords' datatable to update the original dt, and da.update to update the database.

My question is: is this a reasonable approach?, is there a better way?.  Does someone have an example.

Im using winforms and vb.net but c++ is ok also.

thanks very much.