editing / updating dynamic dgrid

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Hello,
I have a dynamic datagrid , made and filled by VB code.
No problem here! But when I try to update my db via this datagrid, Im in
deep trouble!
The problem is that when I do a databind on every postback, I loose the
updated values. When I don't do a databind of the grid on page_load (on
postback), the event dgName_UpdateCommand is clearly not triggered at all!
How can I work around this problem? The datagrid needs to be made dynamicly,
since the data changes every time I use the datagrid (=students, depending
on the choosen class, partition and period)
TIA

Dirk




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