Update Multiple Datagrid Rows

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I'm using an imagebutton in the datagrid footer to update a column of
textboxes in a "quantity" column with new values that the user
inputs. I'm using a datatable, which I then bind the datagrid to.
I've got the basic premise - dim a textbox, loop through the
datatable, find the "Quantity" control, set the values to those of the
textbox in the templatecolumn - but I haven't been able to get this to
work at all after several hours now. I've gone through tutorials but
nothing seems to do it...anyone have a code snippet to share? Thanks
in advance.
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