[dba-VB] ADO.Net data table update

I have a datatable that I opened.  It contains a set of 10K records 
which I have updated pieces of.  I now need to write it back to SQL 
Server.  If I just call the da.update it errors saying it needs an 
update command.

Do I have to build an update SQL statement or will the DA just figure 
out where the data fields came from and update them back out to SQL Server?

-- 
John W. Colby
www.ColbyConsulting.com