Finding text from a single cell in a datagridview

Hi,

I have a datagrid view that I have manually bound with a dataset. It
has a column displayed as checkboxes, what I want to do is update the
database when a checkbox is checked.

To do this I need to find a value at cloumn index = 0 that corresponds
to the row in which the checkbox has just been checked.

Here is what I have:

private void dgErrorLog_CurrentCellDirtyStateChanged(object sender,
EventArgs e)
{
int row = dg.CurrentCell.RowIndex;
int col = 0;

string loc = // Text in cell (0, row);
}

So when the checkbox value changes, i find the row index of it. The
problem is now that i don't know how to set the text in cell (0, row)
to a useable string.

Any ideas?

Thanks.